If your after performace and you can afford it go for Solid State drive(s) as Piru has said.
You can get PCI scsi raid controllers but the cost involved would be huge compared to a SATA setup.
Do you need faster than SATA?.....
I use two 4 port SATA raid cards (with the drives setup using RAID 1 pairs) in my media server in the loft and playback 1080p video downstairs using standard SATA drives without any performace issues.
I picked up the SATA raid cards for about £15 each on the bay and 1TB SATA drives are about £70 these days :-)
