There are several threads related to specific scanners; here I just wanted to suggest that worry about super-high resolutions such as 6400 dpi for 4x5 film is overkill, and will result in many unhappy hours at the computer.
For example, suppose that you are going to print a 16x20 print on the popular Epson 3800 or 3880. You want at the most 360 dpi for the output file. This means a 5760x7200 image for a 360 dpi print. To get that from a 4x5 negative you only need 1440 dpi. Even at that lower resolution you will downsample for web size images, or if the subject matter requires (see http://robertrose.photos/galleries/l...iver-2008.html).
There are many other issues if you are printing, such as whether to use 8-bit or 16-bit files, etc., and I refer you to Eric Chan's excellent website http://people.csail.mit.edu/ericchan/
There is an excellent set of articles about scanners at the LF home page, but in all honesty I have yet to see a single person examine my prints with a magnifying glass. It is subject matter and composition that makes the photo.
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