You can use EAC together with an external drive, if you use the SPTI interface. Using ASPI, EAC might not recognise the external drive.
The two i could find was:
Zynet Polar 5.25
I own that enclosure labeled as "Sharkoon Swift-Case". It is equipped with a Cypress chipset. Fan is noisy, so I disconnected it. At the moment I run a 52x CDRW drive, it seems to work most of the time. But I experienced a fallback to USB 1.1 speed once, and I don't know why. W2k isn't very informative about that. Nero recognises the external drive as "USB 1.0 - poor connection", but I can write at full speed.
Note: That enclosure is also available with Ali chipset.
Is there any diffrence between enclosures other than the ability to brun at 16x?
Main difference is the chipset. The Thermaltake enclosures have the same Cypress chipset like the Zynet. The people here seem to like enclosures based on Prolific chipset.
For I am only running a CDRW drive in that enclosure, I can't say anything about max. Speed on DVD-writing.