You mean SATA150. ATA133 is the highest (P)ATA standard. You should check what your motherboard supports. ATA=IDE, so if it lists IDE in the specs you can use any ATA disk, but ATA133 are the fastest, so get those.
SATA150 is slightly faster and SATAII (3Gbps) is faster than SATA150, but the difference is not that big, so if you want to save money get an IDE disk.
TheMajorMMX - Intel P200 MMX @ 225Mhz - V-Tech (PcPartner) Baby-AT mb w/ Intel Triton TX chipset - Nvidia Riva TNT2 M64 w/ 16MB - 256MB M-Tec SDRAM - Still running.....