I have to wonder if you really need the external raid array. If what you're ripping to FLACs and storing them for a rainy day, raid is perhaps the worst solution. Say it with me here. "RAID is not a backup solution. Raid is a high speed/availability solution"

Raid does nothing to prevent you from deleting all your files accidentally. Raid won't let you get your files back once you delete them accidentally. Raid won't help you if the room where your computer lives burns down. Raid won't help if it floods. Raid won't help if you get a malicious virus. Raid won't help you if your raid controller fails and writes random ones and zeroes across your array.

Buy two USB2.0 enclosures and two hard drives. All your flacs should fit on one 200gb hard drive, so buy something slightly larger. Copy all your FLACs to both. Take one and leave it at your office or some other physical location. You'll have a more secure backup system for much less money.

Matthew