You don't need to spend the money on the sabertooth. Just a bunch of extra plastic. Either the Asrock Z77 pro ( as i listed) or the extreme 4 will do wonders for you. The extreme 4 gets you an extra pci 3.0 slot and gold caps for a bit more.
The i5 series is plenty for any gaming needs. the 2500k or 3570k can both be easily overclocked gaining you plenty of longevity. i7 series is just going to get you a bit more processing power for multi processes or video editing and such. A waste right now for gaming.
I like the coolermaster processor coolers better than the antech. The 212 evo seems to be a popular choice. I use one myself. Its really a nice cooler.
The GTX 670 is an awesome vid card, but if you don't end up wanting to spend that much at least pick up a Radeon HD 7850. Probably one of the best sub 300.00 cards on the market imo. Super efficient and easily overclocked as well. You really need to spend what you can on the video card. That is probably the biggest hitter in the current gaming line up right now. Hope this helps, and good luck in your build.
^ good advice - I remember buying a "deluxe" Asus mobo - used 1/2 of the S*&T that came with it. Put your money with a reasonable z77 mobo and the I5 k version and spend the savings on a better GPU - GTX670 would be best for the money - HD7850 also good.