Recall a while back I was asking for suggestions on big cheap RAID storage mainly for D2D backups ... thanks to everyone for your input.
I think I've finally landed on our end solution after looking at many options ... and perhaps surprisingly I chose a non-ghettotastic solution.
12 bay SATA enclosure ($850)
3Ware 12 port SATA RAID controller card ($750)
Internal SATA to External 4x Multilane Adapters and multilane cables ... need 3 ... ($215)
12 Seagate 750GB drives ($3000)
TOTAL = $4800ish
So under $5K and we've got a little over 8TB of RAID5 storage and since we're already familiar with 3Ware controller cards setup should be a snap. That seems to nicely satisfy my requirements :-)