putting new hard drives in home system. Choices are 2 seagate 160 gb sata 7200 rpm or 2 w/d 74 gb 10000. Money difference in not as important as the whole rig being quiet. Plan on running 2 in Raid 1. Heat and quiet are the issues. not storage.. will have third drive either firewire or something portable. Does anyone uses these . Please advise