Prodigy, let me address your itemized concerns:
"SCSI is so much more expensive that it doesn't pay off with a scanner."
In this case, a SCSI scanner (and a rather good one at that) wouldn't cost any more than a USB model. With the B4L rebate and free shipping factored in, it's about $110 USD. This price even includes a decent Adaptec interface card and external cable.
"system lag? I don't feel anything on my p3 750 with 320 mb ram"
So much for the "SCSI is so much more expensive" comment. A P3 750 and 320MB of RAM... And it is an incontrovertible fact that USB uses a lot of processor power. SCSI, virtually nil. It may not be particularly noticable under light multitasking, but try burning a CD and scanning a high-res image simultaneously. Many people have reported significant FPS losses when simply using a USB mouse.
"I mean, who uses a scanner day in and day out?"
You're quite correct, not many. But why assume that this gentleman will not? Better still, why pay the same money for an inferior scanner?
"not sure what you mean, but my USB scanner IS hot-swappable"
That was not my point, rather that it is impractical to use a scanner as a hot-swappable device unless you really have no other choice, as in the case of inadequate desk space. USB is a decent idea if one wants to share a scanner among multiple computers, kind of a hassle, but workable nonetheless (probably easier to scan the image and email the image or transfer it over a network).
"and what do you mean with "unless you're...blabla"?"
It was a perfectly intelligible comment, what's your beef? I'm a little taken aback by your comments, you seem to have a chip on your shoulder with regard to USB vs. SCSI. They are very different technologies, but the historical battle cry of "SCSI ain't worth the money" just doesn't apply here. I mean no disrespect, just trying to maintain an intelligent debate.
Best regards,
Floyd