Hi guys! I am looking to buy a 500GB external bus-powered drive. As far as I know, most of these drives are based on 5400rpm drives. All of them have USB 2.0 - and if you look hard and pay xtra, you can get one with Firewire 400/800. My big questions is - is it worth paying xtra for this firewire version? How are typical transfer rates of these 5400rpm drives - enough to warrant and make a notable difference in speed with the firewire interface? I am currently looking at these models: iOmega Prestige 500 GB - USB 2.0 only iOmega Ego Helium 500 GB - USB 2.0 only, but beautiful MBP look-a-like design Lacie Little Disk 500 GB - USB/Fw400 and FW800 WD Passport Studio 500 GB - USB/FW400/Fw800 Does anyone know if the WD are aluminium or just alu colour? Thanks!