I'd only go for a "Grade 1" phone, essentially as new.
The only Android phone in my price range is the Samsung Galaxy 550 i5503.
It's a bit hard to track down specific info on it.
First up is the assumption that the particular phones they have, or at least one of the eight, will work on XT. It's not stated.
It's Android 2.1.
2 Mpix camera, which is below my spec, too.
2.8" screen - ok - same as the x1 I think.
Then there's this: