Hi I'm looking at getting an external Hard Drive for my alu iMac (320 gig internal) for time machine, logic and possibly playing movies off. I'm looking at around 500gig capacity. In the UK, the best bets look like Lacie and Iomega, what are peoples experiences with these brands? Also, is it worth spending an extra £20 on a drive with firewire 800? will it be around longer than firewire 400 because i don't want to have to buy another drive if i upgrade in a few years? Thanks for your help.