Samsung have a new drive out, tbh the Seagates are SLIGHTLY faster, but still noisier than the Samsungs
most of the noise is vibration, if your concerned about noise, id definitely suggest suspending the drives
2.5mm "ish" thick "elastic shock cord" from ebay and suspend em in the 5,25" bays (im doing mine this week coming (i got 4mm cord, and its fairly thick, JUST fits in the lian-li cage holes) - 2 x 120gb Seagate SATAs (7200.7, very quiet drives)