amd athlon II 240 AM3 at 3.2ghz
ASUS M2N68-AM AM2+
4gb dual channel ddr2
500gb 7200rpm HDD (maybe another hard drive later for raid)
gtx 460 hawk (to be overclocked)
3-4 120mm fans
Insert good power supply here
What benefits would I get from a single 12v rail on my system?
And is their a reason why the Antec is cheaper although Its rated 100w higher?
Delluser is, as usual, correct . . . and a man of few words
Unlike other parts, a poor-quality psu can damage parts of your PC, shorten its lifespan, and in extreme cases . . . worse. PSU failures cause strange symptoms, More than 50% of the hardware problems resolved here are fixed with a new psu.
The Antec you chose has been around a few years and is well known to us as a very good psu: