I'm maxed out on my 15" PB's 80 GB HD so I'm researching a nice compact HD but need some help. I like the look of the SmartDisk FireLite series or the LaCie Porsche design and would probably go with a 100GB size (are there any bigger drives?). My question is Firewire or USB? I have FW800 on my PB but thinking ahead if I upgrade in a year Apple may not include FW anymore. Also bus powered is important and I'm not sure if that is best with USB or FW. Any tips would be appreciated. Happy New Year!