A GTX660ti needs only a 450w psu. A GTX670 needs only 500w.
I would suggest a unit in the 550-650w range from Seasonic, Antec, Corsair, PC P&C, or XFX.
The sabretooth is nice, but overpriced. You can use any Z77 based motherboard at half the price.
90gb is about minimum for a ssd. 120gb will hold the os and a handful of games.
If you used 180gb or 240gb, you may never need more.
I might defer on the hard drive and use a larger ssd up front.
Intel and samsung are my picks for reliability.