Do NOT waste money on a crappy Coolermaster 1000w power supply with a GTX 660 Ti. A system with a single GTX 660 Ti needs a 450w power supply. 2 cards in Sli need 620 watts. 3 cards in Sli 800 watts .....you only need a 1000w power supply if you plan on running 4 x GTX 660 Ti cards in 4 way Sli!
Also Coolermaster and Thermaltake power supplies should be avoided. There are much better options for the same price or less. Stick with Corsair, Seasonic, PC Power and Cooling, XFX, Silverstone, Enermax, OCZ or Antec.
Newegg seems to be having issues right now but here are some great reasonable choices if the link works.
Quote: " There are a lot of advantages about the Silent Pro M 1000W: good accessories, original exterior design, handy modular cables, low output voltage ripple, high efficiency, quiet operation (except at near-maximum loads) and an affordable price. However, these numerous advantages are negated by one and very serious downside. It cannot deliver stable voltages. "
And without stable voltages you don't have a stable computer. As I said above Coolermaster and Thermaltake power supplies should be avoided.