I had some money left over from x-mas so i figured i would do the smart thing and start backing up. I already have a case picked out it is this one. Now i need to decide which HD to get. I plan on backing up an iMac and my iBook to this, and if at all possible i would like both of those partitions to be bootable. My first option would be to get one big HD like this one and partition it at the 160GB mark for the iMac and the 40GB mark for the iBook and then the remaining 50GB would be for misc. files. My second option would be to get two of these and use one for the iMac and one for the iBook. The one for the iBook would be split at about the 40GB mark and then the ramaining 120GB would be used for misc. files. The first option would cost me $150ish plus tax and shipping. The second option would cost more then that but i could always find a cheaper case and get two to fit the HD's. This one would cost me $200ish plus shipping and tax. So which option is better for me??