I wouldn't get a 660 Ti and I really wouldn't get a Cooler Master PSU. The 660 Ti has a crippled memory bus that works even worse in SLI. Cooler Master is an unreliable brand that is more prone to failure than good PSU brands such as Antec, Corsair, PCP&P, Seasonic, and XFX. A Radeon 7950 is a generally superior card to the 660 Ti, especially when you pile on the AA like you are likely to do in games that can't tax these high end cards well enough without it. If you want a Nvidia card, then I'd recommend that you go up to a GTX 670.
I would not look to SLI on an mATX board due to 'inadequate' spacing between two dual slot graphics cards. It would mean that the two cards were right next to each other so the upper most card would get hotter and the fan would have to spin faster, therefore being noisier than it might otherwise be on an ATX board with more space between the cards.
The Cooler Master Silent Pro Hybrid is a perfectly good PSU (IIRC, haven't checked a review for one for awhile), the only thing wrong with it is that it is overpriced. And you don't really need an 850W PSU for your build, unless you are going to upgrade to more power hungry cards in CF/SLI.
Rosewill Capstone-750M ($110 @ Newegg) http://pcpartpicker.com/part/rosewill-power-supply-caps...
Thanks for the replies! Ill definitely look more into the gtx 660 to see what your talking about and if its true I'll get what you suggested. Also makes since on the mATX board Ill find a new one, oh and thanks on pointing out that the psu is overpriced ^.^.