Enermax 475 @ $85 should be much much quieter than the loud Antec 550.
For the money i'd rather get the Enermax 475 since it has higher Amps on 3.3 and 12V rails. Over the forums here, I read that Antec are made by the same company that makes Enermax (or vice versa). This makes them both quality PSUs. But why overpay for the Antec, especially since its specs are inferior?
Otherwise OCZ 470 or 520.
oh....I also stumbled upon this one -
Fortron 500 BlueStorm
1. It has sleeved cables
2. quiet - 23db fan
3. forton one of the most reliable brands ever in PSU industry
4. dual 12V rails @ 15A each
5. support 24-pin, SATA, and PCIe => ATX 2.0