So one of my clients wanted to get a relatively solid disk to disk backup system going for a production file share running on an Xserve G5 with OS X 10.3.9.
I recommended several raid products, amongst which were LaCie's new Biggest S2S Raid Array, Apple's X Serve Raid, and a couple consumer external FW drive models I like.
They chose the LaCie Biggest S2S. Its a pretty fair price for a 5 drive external raid array. It has a small foot print, and 1TB of storage in the Raid 1+0 configuration with a hotspare. I wish it supported Raid V though.. I'd like to squeeze a tiny bit more storage out of it and still get to keep the hot spare.