Ok Awesome, thanks for the input, the reason I chose the 1200 is because according to the asus power supply calculator is say i would need at least a 900 watt PSU, so i figured too much is better than not enough.
You do not need 900w. A gtx 770 will only consume about 200w. They say it will consume WAY more to protect themselves from lawsuits from people with crap PSUs. 850w is WAY more than enough for SLI gtx770s.