Wrong section buddy.
This belongs in the General Computer Hardware & Software section.
Moderators, move this please.
EDIT>>> You don't SCSI for normal computing, unless you plan to build some server or something. Even then, there are no normal motherboards that natively support SCSI, so you'll need a SCSI adapter that uses a PCI slot.
I would just settle with SATA 3.0Gb/s, it's not as fast as SCSI, but way more practical and cost effective.
EDIT Rev.2>>> Thanks to Lhuser for moving this.