as arough guide serial ata is 150 and ata 133 is obviously 133 and SCSI 160 is 160 but only if your scsi adaptor card supports a 160mbit speed. (newer/more expensive ones do) These are often referred to as LVD.
The 8 mb cache and 10000rpm makes it fast, though 15000rpm drives exist.
so, in brief, your scsi drive would be the fastest in theory but in reality i doubt you will notive any difference across the three types.
Faster speeds will be noticed if you use two or four identical disks in a RAID 0 array. This could effectively double or triple your access and write/read speeds.
However, unless writing very large files you will not notice massive differences.
On cost grounds the best value for money would be 2 RAID 0 ATA133 drives.