You're getting ripped off at those prices.
Go with Newegg, which offers great GPUs at the lowest prices.
Get a mid-high end GPU such as the 8800GT/9800GT or as bossman34 said, the 4830. All of those mid-high end cards goes for around $100-$120 on Newegg. Get that at a minimum if you want to play the latest games at decent FPS. They are leaps and bounds better than the 8600GT and 9500GT.
Don't bother going for a 8600 cuz the 8x00 series (except the 8800) all suck, and both the 8600GT and 9500GT at $100 is way overpriced for medium end cards.