all i recommend is that if you upgrade your video card for (100$ us) (sorry bad with money ratios) to get something roughly the same, id recommend spending an extra 20 bucks on something that will actually give you some improvement in gameplay.
I personally would never ever trust a used vid card.
http://www.newegg.com/Product/Produc...gp+128&Ntk=all
many of these are in your price range, id imagine... most are better than the FX Series (seriously man, dont get another FX card- expecially used!- it wont last you long enough- and your experience with it 'breaking' come on man- ditch those things in the trash where they belong 5x00 series is a marketing joke!)
you want to pay attention to the:
1. core speed (mhz) - get one over 400
2. memory speed - same- over 400
3. bus apperature - get at least 128... no less than 64 if you must go low.
OUt of all of those on the page there, I recommend this one:
http://www.newegg.com/Product/Produc...2E16814121195R
look at the core/memory speed compared to the rest. compare it to any FX card... price/features... id bet on this one.