If you are building right now, the Antec Neopower 480 gets my thumbs up.
But if you're thinking of upgrading your power supply, or building in a few months, then your should consider the Antec Truepower 2.0 power supplies, which has two robust 12V rails totalling 38 Amps in the Truepower 2.0 550.
The Truepower 2.0 comes with a single 12cm fan (internal, just as in the Neopower), keeping noise down.