I've had about a dozen, WD, Seagate and currently using a Samsung Story, it is the only one that has lasted longer than 5 years. One feature to look for is an on/off switch, the WD MyBook series look nice but don't have one and would often not be picked up by Windows.
ps. I have an 126GB SSD (intel) and 256 GB SSD (OCZ Vertex), they are fricking awesome for gaming.