So I'm looking to grab a second 8800GTX so I can SLI, since they are dirt cheap now, and don't have much less performance than the 9800series.. So I already know I want the second GTX, but should I upgrade my PSU as well? I was looking at the Thermaltake 1200watt Modular PSU. I think it would somewhat futureproof me for upgrading? for reference to my hardware.. it's in my system specs to the left<<<<<<< would 1200watts be overkill? if so? what should I aim for? when I use the Extreme PSU calculator, it figured out to about 1010watts needed for a second gtx and all my hardware.. plus a little head room.. I'm also doing a new case. So.. primarily.. I'm looking to see if I should upgrade from my 700watt PSU..