I have a WD 750gig drive that I bought from SAMS. It's only got USB2, so I think it's the cheapest one and probably the same one oyu have. I've used 2.5 to back up to it with no problems. (leopard, SD 2.5) I backup to a sparse image, so I don't ever plan to boot from the drive.
The WD drive is the biggest piece of crap I've ever seen. the power adapter is the same quality you'd get with a $10 pair of speakers. The case is cheap plastic. It's really marginal from a build quality and feel standpoint.
Sheldon
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