OK, first, thanks for all that helped. I got my mini for BB yesterday. The new Mac mini is indeed quite as dead! Love it so far. Only thing is that, it's a bit slower compares to my Mac pro. It's expected. So I need upgrade some memory and harddisk I think. I am thinking if I can buy a new HDD, put it into USB enclosure and duplicate OS over and then swap using Disk Utility booted from DVDROM, is it possible? I hate re-install OS. Anyone did this before that can confirm it's doable over USB? Thanks.