For future reference I find AusPCMarket to be a good point of reference even if you don't choose to buy from them. Has a nice layout and a fair amount of details on stuff:
Drive Boxes:
http://www.auspcmarket.com.au/show_p...tegory_id]=245
External 3.5inch SATA:
http://www.auspcmarket.com.au/show_i...egory_id]=1363

And here's a fair few links from Dan's Data, he's always on the lookout for a good value NAS. The article is a bit old now but still some good info to be had. Aparently the hardest thing to find is one that spins down your hard drives when not in use. If your only going to turn the drives on/off as needed then I guess this isnt an issue.
http://www.dansdata.com/gz060.htm