Try one of these -
http://www.antec.com/us/productDetails.php?ProdID=81800
I have one, very quiet. Its a metal case with soft plastic sound deadening panels over it. On the inside - theres alot of sound deadening bits as well.
Can mount loads of large fan running at low speed - barely a whisper. Have 3 hard drives in mine - one of which is a very noisey WD raptor (10000rpm), but there are mounted on soft silicon shock absorbers so bearly a whisper.
Easy to get into it as well, no nasty sharp edges, good air flow.