ConsumerSearch.com gave La Cie's d2 Quadra the nod. It's highly rated by both reviewers and owners. But more importantly, it has fewer negative reviews than most. The company has a good history of reliability, the drives quiet (no fan!), and they have USB, eSATA, and FireWire connectors.
I went for the 1TB capacity (which I think is the best value right now), but they come in ½TB, 1½TB and 2TB capacities as well.
|Get a La Cie d2 Quadra1TB from Amazon|