I do not believe an SLI setup is justified for a TW game, unless you are running it on multiple high-rez monitors. Second Beirut's opinion that a single good card is a better investment than two downmarket cards. The video card is the first part you're going to replace in a couple of years, anyway. I usually go through three video cards before upgrading my entire rig (but then I like to get an unreasonable 5-6 years out of each build).