1. Theres differences in clocks, overclockability, cooling, afermarket pcbs. EVGAs are normmaly single fan closed cards with louder fans, MSI and Gigabyte have after market cooling setups which tend to be more quiet due to the extra fans. AsusDC2=GigabyteWF2/3>MSI>EVGA in my opinion for the 660ti's of the brands listed Id stay away from newer PNY cards, Zotac and Galaxy are more budgety but I havent heard to many complaints about them and Im sure shroudster will jump in and say something about a zotac AMP
2. Asrock z77 extreme4 or Asus pz77v lk are 2 great boards in the 130~ range. But if you only plan on doing a single card video card setup and less performance for super high overclocking a cheaper 80-90 Asrock z77 pro 3 would be fine as well.
Also Id look at getting a decent 520~ watt like a seasonic 520 over the cx series if you can at least go TX with corsair, or a XFX 550 pro.