I have only seen one of those PCI express SCSI controllers in a system and its a corporate database server owned by a lighting manufacturer in my home town. I have a close friend that is an IT employee for them and he showed me the set-up knowing it would tease me. Couldnt tell you how it actually performs becasue I have nothing to base it against; I tried talking him into letting me install WOW or something on it!

and thats when he ushered me outta the computer room!
Yes you would have to surrender a PCI express slots and pay for a controller
a pair of raptors would be the wisest choice; unless your sitting on plenty of "un-needed" cash !
what I am seeing several of the gamers doing is buying 36gig raptors used on ebay for about $35.00 a piece with plenty of warranty still on them. Install the OS & only your game on that two drivre raptor array
then if you do lose the array you dotn care; rebuild the array, install the OS again and your games and away you go, there is no data to worry about and you will have plenty of speed without crazy investment for under $100.00
gosh how I wish I was in the "spoiled kids club" I could burn "dads" card fast at newegg!