I agree, however, I usually go with a small format drive (essentially they are laptop drives in small cases) as they use the USB port and don't require an external power source (which I consider a PITA).  You can get one of these with 160 - 250 GB for about $60.  They are about the size of a deck of cards.

With USB flash keys going up to 64 GB, this may become an option too (although still much more expensive).

Klebnor

Lotus 123 ~ S-Render ~ OS/2 WARP ~ IBM 8088 / 4.77 Mhz ~ Hercules Ultima graphics, Hitachi 10 MB HDD, 64K RAM, 12 in diagonal CRT Monitor (16 colors / 60 Hz refresh rate), 240 Watt PS, Dual 1.44 MB Floppies, 2 button mouse input device.  Beige horizontal case.  I don't display my unit.