If you are unsure about which video card to get i suggest to use the same reference for choosing a video card as I do which is http://www.tomshardware.com but here is a more direct link http://www.tomshardware.com/2007/06/...for_the_money/
Hope that is of some use, it helps me thats for sure.
In my opinion TomsHardware is the best resource for computer enthusiasts.