A cheaper option is also to buy an external IDE HD case ($20) and then buy an Internal HD (I see 250GBs on sale for under $100 all the time) and house it externally in the case. THe cases can be USB, USB 2.0, or even Firewire. I have an external Firewire to a 7200rpm 250GB drive and it's fast as can be, can't tell the difference between it and my internal HD.