Personally I would avoid external enclosures as they are never as sturdy as pre-made external writers, and theres always a good chance of you having hassles with a crappy chipset.
I have a sony external writer (liteon) and it does the job. It's got firewire and usb. Liteon drives are great readers, and arent that picky on what media you use. LG and BenQ also get my vote.
You didnt mention your location.
If you are in europe I'd reccomend svp.co.uk.