Pretty much any of those manufacturer's FireWire drives are good, and will be bootable. The models typically differ by their # of interfaces (FireWire, FireWire 800, USB) and sizes -- and whether they're intended to be "portable".
So, the best thing to do is to buy from one of these "Mac-aware" manufacturers! You can usually call them, too -- at least at OWC and WiebeTech, you'll get someone who knows what they're talking about, and can answer your questions.
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--Dave Nanian
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