My home kitchen rig (pics are clickable):
http://www.ximages.net/images/55149569002397989291_thumb.jpg
Fans speeds are changed in MSI AB config, maximum 2100rpm, blow out = TY-140 @ 1300rpm, 2 x HD7870 @ 1150/250 + 2 x 7950 @ 1050/250 on stock voltages = 2 x 420Mhash/s + 2 x 520 Mhash/s.

My home PC:
http://www.ximages.net/images/83334997118256058747_thumb.jpg
Very quite, nearly inaudible from 1-2m, 4 x Scythe Slip Streams 120x120x25mm @ 800rpm (PSU, Accelero S-1, blow in, blow out), 1 x Noctua NH-P14 140x140x25mmm (CPU cooler) @ 700rpm, HD7950 @ 950/800 = 475Mhash/s.