Tiger Direct always has some pretty good deals on barebone systems. If you can swing it, I'd get something in the Intel Duo Core lineup.
http://www.tigerdirect.com/applicati...c.asp?CatId=31
When shopping for a video card, make sure it will be compatible with MS Vista (Aero). Most all video cards will work with vista but to get the full 3D effects of menuing and such with Aero, you need something good. Aero is a feature of Vista.