re: All my hard drives are SCSI
SCSI is probably more a habit than anything else now...I think the standard motherboard interfaces are approaching it in speed, if they haven't surpassed it. I'm not even using the fastest SCSI interface.
If I tried to keep up with all the new stuff, I'd go nuts. I need a workhorse, not a sports car.
When I build a computer, my rule of thumb is to find out what the cutting edge is, then I move back from it one step and go with that. I have found this to give me the best combination of performance and reliability.
I documented the building of my current machine here.