What level of RAID? Network or local connection? External or bus powered?
I'm fond of, any usually recommend,
OWC. I use both the
Elite Pro Dual mini and the
Elite Pro RAID. Both were purchased bare and I added my own drives. They will do hardware RAID 0 or 1, and the Elite Pro RAID can be configure to show both as standalone drives, handy for keeping cord cluttter down
However, as I've discussed in a previous thread, the Elite Pro RAID will not indicate a failed drive, so you use RAID 1 at your own risk. Otherwise, it performs great in RAID 0 mode. But it also works well configure in RAID 1 with the OS X RAID software, which does provide drive fault detection to the user.
How cheap is cheap (very subjective)? I consider OWC prices cheap, esp. for the quality/features/design.