I'm thinking on going on SLI mode, currently I have a Nvidia 6800 XT 256 MB, that`s becoming hard to find in Mexico, I can buy a couple of SVGA 256MB 7100GS PCI-E DDR2 for less than 140 US or a SVGA 512MB 7600GS PCI-E DDR2 GEFORCE or a couple of SVGA 256MB 7300LE PCI-E DDR2 GEFORCE for about the...