I purchased an Addonics just about a year ago. It is a 4 drive, esata port multiplyer very reasonable. In fact it was the least expensive raid I could find. It has only provided a scare once, just after I got when I was testing it out. The trick is to stay away from the connectors. For a raid that you are not planning on moving around it has been great. Addonics.com should have a firewire version also.
FCP, Mac Pro, Mac Book Pro, HPX500, HVX200, Betacam, Dvcam
Write for the Edit, Shoot for the Edit, Edit.....KISS Principle
I'm running an 8 drive DIY RAID5 using 8 wd caviar blacks, a highpoint rocketraid 4322, and a Pro Avio 8ms enclosure. Total cost about $2100 and it's fairly easy to put together. I like the mini-sas connectors vs the e-sata mess of wires I used to deal with.
I don't think we're allowed to post direct links, but you can google
"echoblack pro avio"
and the how-to directions are the first thing to pop up. It was pretty dang easy.
A side note:
I have the network version of this solution and it works really well especially if you want it to be quick, easy to set up, and RAID compliant, sharable media. It has become invaluable for us in scenarios where you are working with multiple editors/grx artists on a SAN and you dont want to close out and refresh your drives just to see a new graphic, project file etc. Matter of fact integrating this into the work flow actually creates a situation where the media you will one day need to archive is being archived at the point that it is being shared. For instance, a graphics artist completes some graphics, they copy the elements to the shared drive, the editor pulls the elements into their RAID ... Voila! You have already archived at the point to sharing.