Hello and welcome - I saw your earlier thread and wanted to chip in. I'll just preface this with the usual: my comments and experiences are personal to the combination of me & my particular bird only; everyone's can and will be somewhat different.
I have a Curl crested (9 months old), canaries, 1 cockatiel (14 years old), and horse. I thought about getting a parrot for years prior and had narrowed it down to eclectus or pionus, but eventually decided against both after reading about behavioral challenges for both as well as noise. Actually my cockatiel is plenty loud (and DUSTY) enough for me!
I know someone who owns both a Curl and Green, and for them their Curl is super cuddly but the Green not so much (more aloof).
I find it super relaxing owning a Curl, but I have developed a very regular routine with him. My job has a very regular schedule, no travelling, and I personally also thrive on routine. He is free flying when I'm home and I find rarely poops on anything other than T-stands I have placed in several favorite locations, although there is the occasional accident. If they've been eating blueberries, their poop will permanently stain your wall.
He is VERY content to hang out and watch TV or sit next to me when I read in the evenings, just chilling. Not demanding or noisy in the least, but still charmingly interactive. Occasionally he flies to investigate what you are doing or eating, sits on my shoulder or arm. Then he will fly away to play with other things or poop on his perch. But whenever I feel like squeezing him, (yes I admit I squeeze, smush and do all sorts of other nonsense to him) I just can scoop him up off the perch and he will let you do anything to him. Squeeze his beak, his feet, breast meat, wings, drumsticks, curls, etc etc. Very delicious all around!! He will lay in your hand upside down. FYI I am very tactile with all my pets and have been handling him profusely since he was very young. I know another Curl owner whose bird will NOT be comfortable being held upside down etc.
I went the route of getting a modest sized cage, and letting him get his exercise free flying around my home. But your set up sounds wonderfully spacious, which I'm sure any aracari would enjoy (and in fact, need, if you're unable to take them out of the cage regularly). I heard Curls are more 'docile' than other ramphastids in an aviary situation (with birds their own size or larger) but I don't know about poultry. Maybe if you socialized him early with the chickens? Provided adequate cover for the chickens? (in case the aracari went into play attack mode... which they do on occasion).
I don't have other indoor pets like cats or dogs so my aracari is king of his domain so to speak. But again, so long as your cats/dogs are reasonably gentle and carefully introduced, maybe it's fine if you had them out together. Otherwise, if you have a spacious aviary, maybe it's best he stay there to be safe. They are insanely fast - they can stab something in the eye if they wanted to without you knowing what happened. I had heard of some sad stories where this has happened (to other pets that didn't react fast enough). He will definitely seriously hurt or kill my canaries if he had the chance, I can tell. He even tries to go for my cockatiel, through the cage (my cockatiel is VERY scrappy though, and defends himself quite well, often taking my aracari aback!
I don't think small reptiles or lizards will be safe either. He doesn't miss a thing in his environment and will investigate everything. He has caught flies in midair.
For me, when I get home from work he calls immediately, and I love having him out and about - even if he did have a huge cage, I would want him out and able to fly and explore the house and interact with me regardless. I have a large framed print of a pair of Curl Cresteds (John Gould) and every morning he flies over to it, hangs off the frame UPSIDE DOWN, and offers them some papaya. No joke. Of course, he greets me too every morning - but I don't get fruit offerings!
They make EXCELLENT and IMO Perfect companion birds, if there could ever be one. It's been said before - all the pros with none of the downsides and I strongly agree. No bites capable of ripping your fingernail or lip off, no dust, no noise. I do not find the poop annoying - hey we poop too! - in fact, my canaries are way way messier, seed and dust everywhere. And let's NOT even mention horse poop - I shovel over 7 tons a year of that! (and load & stack 4 tons of hay). So I might be biased but I find caring for birds EASY, at least in the physical sense.
There is no feather dust with aracaris, which is a godsend to me & anyone with allergies. I covered his cage on 2 1/2 sides with clear vinyl tablecloth, and wipe it down once a week with a wet rag (dried on fruit comes right off - although I heard the steam cleaners are awesome). I use an Avitec infrared heater on one side since I like to keep my house on the cool side for winter (55 deg). He rarely seems to sit near the heater though, and seems very comfortable without it. But he was acclimated over a couple months.
My vote is an aracari. I've heard the Curl crested will no longer be permitted to be exported from Peru (hey as it should be - they should be protected in the wild) so unless the Curl owners in the US take up breeding efforts in the years to come, it may eventually disappear from US aviculture. I have been thinking about breeding in the future.
One other thing - it sounds like you are clearly very passionate about getting a bird and did your homework for a long time - couple of years? I say, remember time is precious and there is no such thing as the perfect bird or the perfect time to get one or the perfect situation. Nothing can be perfect - it's not supposed to be - with your passion and knowledge what ever you decide to get, you will make it work.
A co worker told me he went to a birthday party a couple weeks ago, where one of his guests revealed she was recently diagnosed with breast cancer (advanced stage, she was only 39) and now life consisted of battling the cancer, going to doctors, chemo, etc. We all worry about having enough money or ree time to do things we want to do, but if you don't have the health to do it, it all doesn't matter - game over.