There's another thing I wanted to ask that's more on-topic. If you have the money to go all SCSI then I think you should buy us all cheese burgers at McDonalds. If fast disk access is essential to your work or whatever, then it's a no-brainer. As well, it is substantially cheaper too. You can always plug new devices onto the chain and most Adaptec SCSI cards have internal drive plugs as well.
Adaptec stuff is usually pretty good.
Hunt on the Web. There are piles of SCSI tutorials around. SCSI is a really weird standard. Some SCSI interfaces are backwards compatible, some are propriatary.