Ok, from what I can see at OWC, this one should be fine.
http://eshop.macsales.com/item/Apiotek/EC0003D/
I don't think the Sonnet is necessary, and I've read about a lot of annoyances with that chipset. Aside from the fact that you probably won't need to mount 10 drives on it...
I recently picked up this one from my local computer shop:
http://www.byteccusa.com/product/xP-...2/bt-eces2.htm
...and it works like a charm. I bought a pair of shielded eSATA cables to go with, and have two drives going without any problems.
I'm not a big fan of pre-built externals because I like to do my own quality control when it comes to hard drives.
Personally, I use this enclosure:
http://www.macally.com/en/product/ip...?ArticleID=215
...and I slot them with WD Caviar Black 7200 500GB.
The one thing to note about these enclosures is that the wallwart they supply is underpowered. Basically, if you try to put in a bigger 7200 RPM drive, (say 750GB, or more) it won't run. However, you can just call up Macally after purchasing one of these and they will send you a better one for free.
Otherwise, they don't get hot, and the only noise coming from them is the spin of the hard disk itself. Runs lightning quick over eSATA, and it frees up your FW bus completely.
Finally, just remember to update your SIL chipset driver to the latest non-RAID (1.2.5.0) driver here:
http://www.siliconimage.com/support/...3&ctid=2&os=3&
...and you'll be laughing at how slow FW/USB is compared to eSATA.
