FYI... 70 bucks is way too much for a used fx 5200. I don't remember where, but you can get it for $50 + tax/shippping if applicable. Try pricewatch.com.
Also, yes the FX5200 is crap. In fact, the whole FX line is crap imho. For high fps in half life 2, you have to play on direct x 8.0 with any card in the NV3x or something like that. Check anandtech review of Half life 2. Strange how the fx line supports direct x 9.0, but handles it poorly.
The ATI 9200SE and Nvidia FX5200 = about the same. Though, I'm putting my money on the 9200SE, because I'm sure the ATI 9200(regular) is better than the Nvidia FX5200.