You will see your greatest performance boost using the 7200 RPM drives, 10k RPM SCSI, or the newer SATA drives withing a RAID0 configuration. Keep in mind that RAID0 does have some drawbacks.
I have (4) EIDE 80-GB WD SE drives in a RAID0 configuration. I like the performance kick. Sure, if a drive craters, I have data loss. That is what your backup plan is for if you are storing large amounts of critical data. I use Veritas BUE at my house with and SDLT drive. I also have another WD SE drive in the 250-GB size just to store an extra archive copy of important data.
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