I've read people's reservations about cheap PSUs, but THG used the 550W model to build that Pentium D 805 overclocked rig. Any thoughts?
Here's a thought: a cheap psu might work fine, but not consistently. An example is my Aspire 680 wt psu. Some reviews rate the company as poor, another says the company is unscrupulous. Yet mine has worked without flaw. So what gives? I might just be lucky. Maybe 9 out of 10 fail and I got the one that worked. I don't know. The Aspire company has acknowledged a bad past reputation and claims to be working to be trying to put out quality products now. Maybe that's why my psu is working fine, but maybe their claim is just a way to sucker people into buying their products. I don't know.
Overall, when hardware shows quality work, its going to cost more. Prices can be cut be using unrealiable compnents or by poor quality control, or both. To a great extent, the addage that you get what you pay for is true. You may get less than you pay for, but you won't get more. There are a few psu manufacterors that put out a good product, but charge too much. You won't get bad stuff from them, but you'll pay too much for what you get. The trick is to read reviews from several sources (Tom's, Anandtech, etc) ask for opinions of others who use various brands, and then make the best choice you can.