Hey everyone, I'm in the process of buying PC parts for a new GAMING computer i'm going to build myself. I'm building it for games like WoW and CS:S. I've got the CPU, PSU, And all that stuff. But, I was in a discussion today about Graphics cards. I was originally going for the ATI 100-435721 Radeon X1900 CrossFire Edition 512MB 256-bit GDDR3 PCI Express x16 Video Card With another ATI 100-435805 Radeon X1900XTX 512MB 256-bit GDDR3 VIVO PCI Express x16 Video Card But, i heard from someone else, that a NVIDIA SLI hardware would be much better. I found it hard to believe myself, so I'm asking everyone. Which Would be better for gaming? (For games like WoW / CS:S) The graphics cards listed above, or a Nvidia SLI?? Thanks .