I'd suggest finches. They come in some pretty amazing colors, you know.
What are your intentions? Seeing the thread title, let me just say-
parrots make terrible pets. No dedicated owner will deny that.
As
companions, however, they're better than any other animal. Besides people, of course, but that's debatable

If you just like the way they look and sound and flutter about, I'd go for tropical finches or budgies at best (Keep in mind even the humble budgie needs flockmates,
stimulation and a nutritious diet!). Screen cages can only hold doves and other softbills anyways.
And when you say 'an arm and a leg' how much are you talking? Because as a general rule, birds are expensive. I spent $90
on my conure for Black Friday and only bought some food, two dishes, a tabletop perch and a little wood perch.
And that's 20%-40% off.
As to where to buy the bird, look up a local rescue. There are always plenty of brokenhearted little guys looking for good homes.
Try and spend time with them before you make any decisions!
And while your cage can probably be modified, I'd suggest buying a new one. Only after you decide what species you're getting, so you can find one with proper bar spacing.
