I have just bought and installed Antecs new Truepower 430W PSU, and Im very please with it.
Its really very quiet - MUCH quieter then my old Antec 300W PSU. I currently have a roomtemperatur of 28C, but the back 80mm fan still doesnt go over 1700rpm - even after 1 hour. The 380W version got less favourable ratings in this site because of "unexplained coil buzz", but was probably a bad specimen. I sure as heck dont hear anything like that in my PSU. I can wholeheartedly recomended this one.
Antec homepage: http://www.antec-inc.com/p_truehome.html
Truepower review: http://www.envynews.com/review.php?ID=97