I read two types of posts today, and each one gave me the exact same information. First yours, which was harsh, as you admitted, then another, who was friendly and said the same things that actually taught me something. Sure, It's a matter of telling me what I needed to hear, but you know I was just curious and it really felt like I was being punished just for asking questions. I was called "ignorant" and you even said God forbid that I own a parrot. Seriously? It just felt a little too much.
First you're to be commended for seeking advice and coming at this from an angle of forethought and planning. Good on you Mat.
Second, parrot people can be...intense, lol. We really, really like and care for birds- ours, everyone else's, all of them, and generally all animals in general. It can lead to us saying things from a place of protection and concern. Everyone here means well, and is trying to do right by you by not sugar-coating or varnishing the reality of time/cost/expense you'll be investing.
Third, brushing aside remarks on both sides, if you're still reading this thread, you've started to cultivate a good mindset. I'll PM you this too. Volunteering to care for abandoned birds is a good way to understand the issues that come with bird companionship (ha,
maybe all of them, all at once!)
I've wanted parrots practically my whole life, but then didn't get any after a short stint with parakeets when I was around 13, until I was in my early thirties, had a home, space, and money to essentially put towards something that wasn't food/shelter/etc. That's not to say you have to be super rich or anything - just that you need to make sure you're settled and stable before you can provide that for others (yes, I know your [edited] post reflects these admonishments).
All that said, interact with birds as much as you can, at shelters for example. You're young and when you're young, your preferences change. A lot. I think in time you could be happy with any kind of parrot or bird companion, with enough contact and exposure. They all have their own kinds of personalities. Larger species = longer lives, therefore you'll have them around for a greater span of your life, but every kind of bird can provide a rewarding and enjoyable satisfaction of company in its own way.