if you’re only playing a few games, just got for a dx9 card, their cheap these days. (sub 100) and still perform great.
or if you want a DX10 card, you can get an 8600GT on the cheap as well (120-ish). All the benefits of DX10 without the price hit (HDCP compliant). It’s not high end by todays standards, but it will hold it’s own.
or if you’re looking for something a little quicker, go for the 8800GT… you wont be sorry