Hi, I am going to beef up my sons computer enough so that it can play COD2, BF2 and NFSMW at at least minumim settings. Now it won't even load COD2 (not compatible with video card). Right now it is a 1.8 pentium with 384 of ram (speed??), 20 gig hard drive and ATI radeon 7500. I am hoping that a new video card and some more ram will be enough, so my main question is which video card to get for cheap?