I've had great luck using Vantec brand case fans. They are very quiet. If you find fans or power supplies that spec under 22db DBA (and there are some lower than 19) they'll be pretty darn quiet.
Try
www.pricewatch.com and type searches like "silent fan" or "silent power supply" and like I said,
www.endpcnoise.com is a great resource too.
Zalman CPU fans are good too.