Let the hive mind of Engadget get that for you.
"I commonly need to boot a system from an external disc and take a snapshot of the host system. I also then need to burn a copy of the image to a DVD. While I can do it with two separate external devices, and two power supplies, and two I/O cables, it'd be nice to find a small dual-drive enclosure. It would need to have USB, eSATA, and FireWire. Either slim-line or half-height bay for the optical burner would be fine, and space for either a 2.5- or 3.5-inch hard disc. Any ideas?"
Something to watch for, that I don't think they'd originally mentioned, if you chose a name that is different to your original (user) name then it can get a little confusing as it may not match the @ replies in messages (so yours would currently appear as @GadgetGeek even though it currently appears as "Unverified").