OK if you go with ATI just DO NOT go with SE. SE is the slowest make of their cards. To tell the truth, I could barely tell the difference from a Compusa Radeon 7000 AGP 4x from my Radeon 9200SE 8x.
I would say go with the fx5200.. but you should really think about getting something better like atleast 5600/5700.. because you are ultimatly aiming for a good card, right?
What have you heard bad about the FX series ?