Vic,
I just use a IDE/SATA USB adapter and a standard old IDE or SATA DVD-ROM or DVD-RW drive (always have at least one on hand). Portability is not an issue since I keep it in the shop.
http://www.directron.com/cbisatau2.htmlI have 2 of those adapters and they are mighty handy. You can connect just about any drive with them.