What kind of bird should I get?

I've been a bird owner now for a few years, and perhaps this is an immature question to be asking, but what kind of bird should I get next in your opinion? I don't plan on getting it for the next couple of years. I own two healthy, if grouchy, adult budgies, and a loving, sweet young atiel. I've worked with finches, injured wild birds, and parrots before. By the time I decide on the bird, I'll be in a large-acreage house, and will have no other inside pets. I find that I much prefer companion avians, but I'm also an on-and-off bird watcher. I do have a great deal of patience (only with birds, it seems:) and can put up with bites and hisses, but I think I'd like a bird that's somewhat easy to train, and not extremely expensive, though I'd certainly be willing to put up some money for an excellent bird, and I always do a lot of research before purchasing any pet. Thank you for your answers!