Yeah, and 2x15,000rpm Ultra320 drives in a RAID 0 array will cost you a fucking fortune too.
The cheapest SCSI drives I found in a quick/dirty search are FUJITSU 36.7GB 15,000RPM SCSI HARD DRIVE, Model MAS3367NP, OEM DRIVE ONLY for a paltry $209/each!!
Now, I've never built a RAID SCSI array, or even looked into it, but this card below, is for setting up a RAID SCSI array (if I'm reading right). Sorry about my lack of experiance w/these arrays, I just admin the system. I'll call E=MC2 if our storage system needs work, I don't build 'em myself.
LSI 64-bit PCI to Ultra320 Dual-Channel SCSI RAID Storage Adapter Card, Model "MegaRAID SCSI 320-2" -RETAIL
Specifications -
Ports: 2x Ultra320 SCSI for the absolute rock bottom price of ONLY $599.99.
Now, again, I don't know if you'd need that card to run the drives in RAID or not. Either way, RAID in a home PC is so much overkill, for so much extra expense, it's actually not funny.
I mean, do you need to pay $400+ for 72GB of space? I don't think so.
Also, if you read Maximum PC, or want to look through
Anaandtech , or
Storagereview.com , you'll find that the RAID "is so much faster" thinking is turning out to be so much bunk. That does suck, because we all thought we were so cool for knowing about RAID and how fast it was. Bummer it's not really...
Anyway, either of those sites is a massive wealth of information about your question. Look through them, and I hope you find what you're looking for.