Driver link Those should be the drivers for your current card. They are a little newer than the ones you have, but not much. They may solve the issue your having but I doubt it. It's a pretty old card.
New egg link
For new ones, work your way down that page, Ive ordered them lowest first. There are some ok bits of kit. If i were you, you might want to pick something from there and then see what people think, people might be able to suggest something slightly better if you give us a bench mark. Also, I'm just using newegg.com because others have, i don't actually know much about places to buy things state side.
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Anyone who isn't confused really doesn't understand the situation
http://craigk.org/pictures/
Can you work out the code?