pretty good choices, but WoW does not benefit from SLi at all. many will tell you to turn that off for performance boost. quad core is best for multiboxing vs dual extremes, tho there are people that use duals. quads, you can dedicate each account to different cores as well as the OS. it lightens the load on WoW and you get better performance than with dual, everything running from 2 cores vs 4.