Like the original poster in this topic I'm finding the variety multi-drive external enclosures quite confusing.
This one at the url below was recommended earlier and I think someone purchased one.
This one uses IDE drives and is $440, but at the links below it looks like I can order a 4 drive FW case for $150 and four removable IDE tray kits for $15 each for a total of $210. If I want SATA drive kits they are $45 each for a total of $330.
I know the more expensive one has digital thermometers, but otherwise is there any difference?
P.S. If you think these are hard to find in the US, you should try finding one up here in Canada. They are not available anywhere.