Just thought I'd update myself.
I ended up not getting any one of the scanners I listed. Instead, I got a Nikon Super Coolscan 9000ED. Just arrived this morning. Just from my initial tests, my official statement about it is -- this thing is friggin' sweet.
The only problems I'm running into are keeping medium format film flat in the film holder which is a little quirky to me, but I'm workin' on it.
Okay, that's all.
Sam