Also you could go with less wattage on your PSU, and get one that's 80 Plus certified.
The Antec EA-650 is 80 Plus certified -- not that that's a mark of quality. I agree though, get a lower wattage unit.
Here's a suggested setup: http://pcpartpicker.com/p/busD This will perform better and it costs about the same. Please do yourself a favor and forget about the Radeon 6750/6770. They're rebadged 5750/5770 cards and no one should be buying those when you can get a 7750 for just over $100. You can easily save $40+ by getting a cheaper motherboard, too. The idea behind getting the Asrock Z77 Extreme4 is so you can easily upgrade to a Core i5-3570K at some point and be able to overclock it. If you don't care to have the option of overclocking, then get http://pcpartpicker.com/part/asrock-motherboard-b75pro3 instead, for example, and when you want to upgrade your CPU, get an i5-3450. And if you get the cheaper motherboard, you have more money to invest in a better video card. Any card you could get within that budget will work fine on the PSU I included.
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.