I wouldn't recommend the Corsair CX or RM series. The use cheap components and are problematic. The Corsair AX & HX are better choices. I would recommend Seasonic, XFX.
There is a good buy at Newegg.com. $69.99 on sale after rebate.
EVGA SuperNOVA NEX 750 G 80 PLUS GOLD Certified 750W Active PFC ATX12V v2.31/EPS 12V v2.91 SLI Ready CrossFire Ready Full Modular PSU 10 Year Warranty 120-G1-0750-XR NEW Haswell Ready Power Supply Int
http://www.newegg.com/Product/Product.aspx?Item=N82E168...