Cheaper alternative to Promise UltraTrak RM15000?

Hello everyone

I'm thinking of buying the Promise UltraTrak RM15000 for personal use,
since I have 15 WD 100G drives.

The problem is, I'd rather not go with a SCSI-IDE solution, I'd prefer
a Firewire 800 raid case that'll hold 12+ drives.

I'd also perfer a tower system, preferably aluminum casing vs the 75lb
metal rackmount RM15000.

I am putting together a nice Shuttle XPC that I'd like to hook up to
the DAS solution via firewire instead of losing the only PCI slot to
my Adaptec 39160 card.

So, anyone know of a decent hardware raid based aluminum firewire 800
tower that supports at least 12 drives? 15 - 24 drive support would
be great, but I'm not too greedy

Thanks!