Another cheap option is to use software raid in Windows. You can modify some of the Windows XP files to enable software raid and the overhead is pretty minimal. Do a google search for Windows XP Raid Hack and it's the first link. I've done this on several machines with zero problems so far. This box has 4 320g SATA drives. The OS is mirrored on a 40G partition, there is a second 40G partition for data (non music) storage and a 767G raid 5 partition for music. Performance is a non issue, at least with a 3ghz processor. With this config, this will become the owners main PC and his Squeezebox server.
YMMV.
