I bought a 500 GB MyBook in the $200 price range, it works good. Only thing is, as i was transferring everything, I remembered i left my fone charger behind the drive, reached for it and boom, the HD fell on the floor (about a 1 foot drop) and seeing as the power button is a fat circle in the front, it turned off and corrupted all my data,, then i brought it to CompUSA where they charged around 70 bucks and they restored like 85-90% of my shit.
But anyway, I recommend the MyBook.....get the USB one, Firewire is more money and you really dont see a noticable speed difference. I dont think Ill ever need more storage in my life..500 gb.