I'm trying to decide which video card to buy with this new system I'm building. Gaming will definitely be done on this computer. The specs are going to be an AMD Athlon 4000, with 1GB of RAM (to start), on an Asus A8N-Sli premium motherboard,and at least one 250 GB SATA harddrive. I've never used PCI-express so this is new to me. I want to eventually run dual video cards but finances don't allow it now. Any help or suggestions on brand, specs, what to look for would be great.