Reviews I have read indicate the WD MyBook Pro II to be the best choice. That said, I would never buy a pre-built external drive, I am a builder
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. I would (did) find an eSATA (or FireWire or USB2, whichever option is available to you) enclosure like this:
It has a switch (to shut down drive when not in use), its own power suppply, but no cooling. Its aluminum case keeps it cool enough during use. I would pair it with an inexpensive SATA drive like this:
rather than buy a pre-built unit. I already own what I consider the best backup program, SyncBackSE (from 2BrightSparks, $24), but Acronis and others make good backup programs.
Were I to build an external box today, I would not depend on a single drive, I would go for a minimum 4-drive RAID 5 array (3 drives and a hot spare). IcyDock makes a nice unit:
and so does Norco:
These units are NAS systems that you can grow into, you don't need to fill them up right away. You can also build your own using a free open-source program called FreeNAS. Good luck with your decision.
Tony
"Buy what you like, or you'll be forced to like what you buy"...me