I would stay away from SCSI on the basis of cost, even though its faster than the ATA/66 that you have now. I would suggest that you purchase a 160 or 250 GB ATA drive. They are incredibly cheap these days. I purchased my 160 hitachi for around $60 after rebate, but even better deals can be had these days. You won't be able to get a SCSI drive at 250GB for SCSI at any price because they don't make em anymore that i know of. If it comes down to speed, take a peek at the Firmtek Seritek Internal SATA PCI interface and get yourself an SATA drive.