Either Corsair’s HX520/620 or VX550 would be a great choice. The HX have modular cables, while the VX do not. That’s the main difference. They’re all very efficient. Not cheap, but, something I’d keep an eye on for my own rig.
OCZ GameXStream/FSP Epsilon (OCZ rebadges the Epsilon units) are decent, as well as the Thermaltake Toughpower line.
You’re going to look in the $100-150 range for these units, but certainly worth the money.