I'm looking into a new external, mainly for backup purposes. I'd been focusing on the MyPassport and FreeAgent series, but then I stumbled upon a WD Elements 640 GB on the Egg for only $99.99. The Elements models look ideal for me: cheaper but only slightly larger than the Passports, and still powered via a single USB port. However, I can't seem to find much information about them and it seems not a lot of retailers even carry them. Anyone here have one? If so, comments on reliability, speed, etc.?