X-bit labs - Articles - Three External Hard Disk Drives with 120GB Storage Capacity (page 8). Well these USB 2.0 drives will never be as fast as IDE drives, but it isn't bad.
The WD1200JB stuffed into an external enclosure for $200 vs.$80 if it comes as a internal drive, so there is a premium. Still this, plus the Linksys NAS make a pretty amazing combination of low power, no fan and lots of storage