SCSI
usb 2.0 SCSI - Adaptec usb2xchange, available from usb-2-0 $90
short cable, so probably good idea to get a USB 2.0 extender cable too.
scsi cables, available from cablesandconnectors
scsi terminators, available from smcelectronics
adaptec SCSI at newegg
adaptec 2940 narrow SCSI adapter at newegg $236
HBAs and RAID Controllers For SATA and SAS Drives, available at adaptec