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?"
And if you want another alternative, you can get good value and no quibble from Domestic and General insurance. The latter can include accidental damage from the date of the policy being taken out, so is exceptionally good cover.
I have no vested interest - I just want to pass on some helpful advice.