5200? you can get one for under $100. but it's slower than crap. even the 5600ultra is beat by a 4200... and the 4200 is a lot cheaper. the 5800's are too loud. i'd stay away from the fx's unless you're gonna go with the 5900.
for $200, go with ati. or get a really nice (eg. albatron p-turbo) gf4 4200-8x 128mb and keep a few bucks.