I have 2x 250GB and 1x500GB HDDs (hotswap) in my current PC. Which I want to connect to the new iMac 27" once I get it in December(assuming the month it expect to be release). I am thinking of buying a 1TB or 2TB Harddrives to move the stuff onto that with no external power required I am thinking Lacie drives but they are quite expensive for my liking. I already have a a Netgear ReadyNAS Duo, which i don't fancy messing with that.