Just installed 6 new servers and they have LSI MegaRAID SAS 9240-8i controller cards for Raid 5.
Spec'd the servers after a detailed discussion with the sellers server designers who took on board our needs and budget.
Servers run Windows server 2008 32bit for curriculum and 2008R2 64bit for Admin, 4gb Ram curriculum and 6gb for admin, each server has 1.5tb of storage set up Raid 5 giving us 1TB of usable storage.
Tandberg 320GB SATA RDX drive for local backup.
Servers run great cost about £2000 for each server.
I think the raid cards cost about £230-250 at the time.
hope this helps.