Would like to get an upgrade for my video card. What is the Max I can use for a card and what would be a good choice? Like to keep cost to $120 mark or less. I play World of Warcraft. At some point I would like to attach to a TV. DELL Dimension 8400 Intel(R) Pentium(R) 4 CPU 3.40GHz 3072 Mb Mem NVIDIA GeForce 6800 256 Mb PCI