Here is a good card for gaming for less that $100
http://www.amazon.com/XFX-Radeon-PCI-Express-Video-HD485XZNFC/dp/B003BNRFC4/ref=sr_1_1?ie=UTF8&qid=1299551669&sr=8-1
It's not quite as good as the one you chose, and doesn't have DX11, but it is 25 dollars cheaper and they are pretty close...