All I can say to you guys is to at least learn what computer parts do what... First of all, the thing about Asus rampage is that you do not buy an Asus Rampage. There are much better motherboards than Asus Rampage at half the price.
Second, i7 860 @ 3.2GHz is nothing. Don't try to brag for big numbers. I have an i7 3770K @ 4.3 GHz and it is still not that good.
Third, a rig with SLI 690 would definitely be great but overkill. A single 690 can play any game out and any game that will come out for 1-2 years of time at max settings. All you would do is waste money even if this is a dream PC thread. Wasting money on something that doesn't make your performance go any higher than what is already max is worthless. And yes, as Snowbrdd said, 1500 is overkill for SLI. I have quad gpu's with 1500 W and I still have a bit more juice left. GTX 690 SLI needs a Power Supply of at least 950W. 950W should be more than enough for the other stuff you guys are putting in.