Drop the Z77 chipset and go for the H77 chipset. Some choices are; Asus P8H77 series, ASrock H77M and the Asrock H77 Pro/MVP. If I remember, there was a motherboard from the Asus P8H77 line-up that supports SLI.
No to that PSU. Get one from Corsair, XFX, Seasonic, PC&P, Antec or Silverstone.