You don't need to buy a RAID card w/ ICH5R (Score 2, Informative)

Intel's ICH5R south hub seems to provide good RAID support and is lots cheaper than the PCI cards.
http://support.intel.com/support/chipsets/ iaa_raid /

Sadly no Linux drivers yet, but the performance seems better than other cards due to no PCI-bus limitation:
http://forums.overclockers.co.nz/show thread.php?s= &threadid=8156&highlight=raptor