I decided to go withe the Canon 9000F - it got very good reviews when I searched around, slightly better than the V600. Plus I have used Canon scanners for 10+ years.
So far so good - but I have a lot of cleanup to do from the first few scans:
Peggy's Cove, Nova Scotia, 1983, scan of Kodachrome 35mm slide
Barn, Lancaster, PA, (1982 I think, I need to find my notes). Horseman 985, 6x7 back, 90/5.6 Super Topcor lens as I recall.
I figure if I have anything fantastic I'll send them off to be professionally scanned and cleaned. When I went through my 4x5 negs there were only about 20 of so I would want scanned so the Epson v750 would not have bought me much I believe.