Choose your video card carefully - do some investigation first. Nvidia is allegedly having some problems with their packaging, allegedly lots of alleged chip failures, allegedly mainly in their mobile products. HP and Dell have allegedly been replacing Nvidia video modules at a high rate for some of their allegedly high-end products, and there is allegedly some concern that there may also be problems with their desktop chips.
I haven't been keeping up with this for the last few weeks, but last I heard, Nvidia has denied (or declined to comment) on these allegations. Even though several manufacturers are allegedly replacing tons of Nvidia products.
Allegedly.
(And I'm not saying stay away from them - I'm running both Nvidia and ATI kit and like them both a lot.)