While I agree in part with previous 2 appends, note that it's also true that we're talking about small money here. All in all, my cmd649 UATA100 card costed 35 euro, and it even does RAID0 and RAID1!!!, so for me the performance gains are worth the cost.
Going SATA is a much bigger investment (buy new hw, hdds or cdrws, and maybe a new mobo?), AND performance gains will be not that far from ATA100 or ATA133
Going SCSI is even worst... costwise
Regards
FTC