heh, I'm with you there. I got a nice U2W SCSI RAID card that someone had pulled out of a server and got for free. But the fastest drive I have is a Barracuda 9LP and those are camping out on the 2940W card I pulled from a P90. The RAID gets the Barracuda 9's (I paid $20/ea for the 4 drives and got the SCSI RAID card as an extra). The heat from these things is a PITA. To me the main advantage of SCSI is the ability to pack in the drives w/o alot of cables and the complexity that goes with them. Set the ID, set termination on the last drive of each cable, you're done. No primary/secondary yada yada yada...
But that's another thread in itself.
My main system and the media player system have two IDE drives each, and they both are on seperate channels. I try to seperate which drives are going to be accessing at the same time whenever a system is going to have a drive share a cable. Bus contention can really bog a system down if a worst case scenario comes up.