That Canon scanner is quite old technology. It is slow and barely able to keep up with the demands of modern photography. SCSI (in the Canon form) is long gone. The Minolta is my pick of the litter right now if for no other reason than it has better support for 120 roll film negatives than the Nikon. I have used both and while the Minolta has better specs on paper...
Nikon is so close in quality - given that after scan processing can correct much of the difference, You could buy either one and never see a scan from the same neg which 'looks' noticably worse. Firewire and USB 2.0 are a non competition. there is SFA difference in the two. In Australia the Nikon importer plays God so I'd probably go the Minolta just to get further out of their grasp.
As an after thought. Epson have just released their new 4870 flat bed scanner. Has ICE and really good specs. Maybe worth a look? I ordered some yesterday so you can look for my mini-review and comments of it on
http://www.technoaussie.com next week. Have a look here if you are interested:
http://www.epson.com.au/products/corporate/perfection4870p.a sp Your call at the end of it all.
Douglas
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My Canon is a 14 bit scanner, hence the maximum "Dmax" is 4.2, but that's not "real world." Do you have any experience with the Minota 5400?