You've received some pretty sound advice here.
You reasoning list is all over the place. Because they stand out against your furniture? I've got to say that is the oddest reasoning I've ever seen lol! I can see the appeal, maybe?
There is more to "looks good against my furniture, can see pin feathers, adequate size." What about the noise? Are you aware how ear blasting these birds can be?
You mention they are "slow moving," but I am assuming you have never seen a peeved off cockatoo who decided he did not get his way and was NOT happy about that. Are the black toos said to be more docile? Yes, so we've all heard. But does that make them any less dangerous or ticking time bombs of a gnarly bite at some point? Heck no! I would not recommend getting into owning such a parrot and assuming X, Y, Z about them. There are certainly general stereotypes around species, and you may have met individuals with these stereotypes, but you must be prepared for the chance you get the polar opposite.
Stereotypes are just that - what we assume something will be like when in reality it's not black and white. You may get yourself your dream black Too only for it's personality to begin to set in and all of a sudden you have a feather terrorist living in your home.
One of these birds (or any bird for that matter) at a Parrot Mountain-esque facility is going to have all it's needs met and more (though it appears many on display are clipped which is a no-go from me). They get endless amounts of social interaction, natural sunshine, and I would hope? proper diet EVERY single day and that helps keep many behavioral issues at bay that stem from lack of proper care. In a home, in a cage, while you're at school, work - that is a totally different ballgame. No sunlight for Vitamin-D, no stimulation of seeing the outdoors - sights, sounds. I mean it is night and day with these facility birds and a pet bird at home. It's not the same.
Do more research while you think more on it. Do research on how your life may change, as well. What are your goals and ambitions? If you don't have any, how will you manage to afford this luxury-priced parrot? How will you manage to keep that LARGE beak at bay. Did you know a Cockatoo of this size can shred a $50 wooden toy within 1-2 days? Did you know their dander will need to be maintained with proper ventilation, air purifiers? Did you know that their dander is harmful to you in the long run? Are you aware that these kinds of parrots thrive on and indoor and outdoor aviary? A "macaw" cage won't cut it. Any cage in the US that is marketed for "large macaws" "large cockatoos" are never enough. They are incorrectly marketed.
Think about all the variables that go with this, everything that can and will go wrong. What if you get a personality type that you dislike? What if this bird likes you at first but as it matures (or if it's older, as it becomes comfortable), you're suddenly losing your new bestie to your mom, dad, brother, sister, that random guy who visits once a week?
It's a lot for a young adult. I could not have done it, I know that much.
Think about it!
I've seen angry cockatoos before. I surprisingly didn't find the noise too bad. I'm a gamer, I scream myself. I'm not afraid to admit it. Well, however, my father is a different story. He's usually outside, though. I don't think it'll be a problem. Regardless, I always have a pair of AirPods Pro on me.
Yes, I'm aware of the need for purifiers. I've already worked on removing stuff like non-stick pans, too. Those things suck, anyway. I know about toy destruction too, and I've decided to hand-make my own to cut down on cost, most of the time. Of course, a wood block alone will be entertaining enough. Vanta destroys toys way more than I was expecting, and I'm fine with that. He destroyed one of Stella's (his girlfriend) toys that she had since the first week, in just 10 minutes.
Sunlight? Planned for that. I chose a room with two windows and a lot of outdoor visibility. I very quickly chose to skip out on UV lamps. There's nothing I can do about the occasional storm, though.
It's carpet though. This entire house is carpet, except for the main downstairs room. That's all hard floor. The downstairs is also almost completely underground. Too cold and dark down there, even though it would work better otherwise.
No, my garage is not carpeted.
Oh, and for the dander, well, heh.
Will this fan work? Turn it on, and you have a wind tunnel in the comfort of your own home! Well, at least it *was* comfortable. And quiet.
It's a giant outtake fan. I'm pretty sure this thing will get dander out. This puppy makes an angry cockatoo sound like its on mute! Boy, is this thing loud. You can hear that electricity running in when you turn it on initially.
I wanted to build my own cage. The cages I see on Amazon are both too small and too vertical. Parrots don't fly up, they fly forward. Even the outrageously expensive 600 dollar ones are pathetic. Those "macaw" cages are cockatiel cages. I'm building my own.
I have access to healthy foods. We could easily afford a good parrot diet. Both of my parents have great jobs, my Dad will have direct government benefits by the end of this decade, and I myself show a lot of potential for work. We're doing extremely well.
Personality? Well, I'm going to work to make sure this parrot likes everyone. I don't want it to only like me. One major thing that I read about cockatoos is that they can grow too attached to their owners and attack strangers. I want to surround it with as many good people as possible, and raise it from a young age. If it stops liking me? Well, even though I doubt that would happen, I've had plenty of people stop liking me before. At that point, there may be some other major problem, and rehoming might be something I consider.
I don't dislike any personality type as long as it isn't aggressive. Randomly energetic, cuddly, lazy? I can live with it. I love animals regardless. I just don't want to cause injury to people or other animals. They need a good soul to be raised, and I'm fairly confident that I have that good soul. Raising parrots is all about the wide variety of personality. I go by stereotypes for a general direction, but I'm prepared for actual results to be dramatically detached from expectation. I'd say I'm flexible enough to manage it. I still won't bite more than I can chew. If a major problem occurs, I won't ignore rehoming.
I've worked to make my future as stable as possible. This is the most important thing that I considered. I want to be self employed. I want to make YouTube videos documenting this journey, and make music. I want to be directly supported by the audience through Patreon and Guilded instead of taking sponsorship money and ad revenue. I just need to keep on my toes. If I don't find success there, well, I'm graduating from a STEM high school, of course I'm getting a good job. Walmart!
All this stuff has been considered. I didn't mention this knowledge because, well, I didn't want to have to type it all out for the 50th time. I'm new to this forum, so I guess I should have just did it once more. People here have been way nicer than the other one I have found, though.
Well, thanks for the concern. I don't want to leave anyone scared.