This might be a long post, but please do read it! At the very least the paragraph with the link
People need to learn that efficiency means VERY LITTLE. 80 Gold is a waste of money for the consumer, even if you overclock. The average user normally doesn't go over 12/7 and rarely puts a lot of load, so your 80 Gold won't do enough to save money.
If you have a lot of money you can go 80 Plus Silver, else you go Bronze. What matters in a PSU is: the power it provides (Watts and Amps),
Ripple suppression,
% of voltage regulation on each rail (3.3V, 5V, and especially 12V), has to do well in the Overshoot Transient test (no/small spikes only) and finally it has to be built well for longetivity and be safe.
The first point I bring is obvious, it has to be enough amperage/watts, but as I will link to you later, peak efficiency is in the 75~90% range, and depending on the unit, may drop substantially at 20% load, and even further at 10% load. This is important because when you idle or use your computer for web browsing and such, you aren't getting great performance at all, so it is important to not overdo things. Also, you are basically suggesting he get a 80 Gold 1KW PSU... Do you know how much those cost?!?
Then I bolded the 2 most important ones, voltage regulation and Ripple suppression. Theses are going to help you a lot in overclocking, and generally measures the quality of the PSU and the quality of the power that is given to your computer.
THIS IS WHAT MATTERS
If you look here:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=256 you can see that the PSU is basically getting 80 Plus efficiency numbers except at LOW LOADS, where it even barely passes 80 Bronze (ie: don't buy a too big PSU). You see that it gets good voltage regulation. So far this is a great PSU until... It barely passes in Ripple suppression. If you look after 20% load, this is performing like an 80+ Gold, but sucks at the Ripple test. I wouldn't trust this PSU anymore and here we learn the efficiency doesn't mean anything in quality.