i am rescanning all my 35mm color negatives now. In my test, tried linear gamma 1.0 tiff with silverfast and also nikon scan tiff and nef on gamma 1.0. All with color management off. No color profile embedded. Output files from scanner software seems to have diffferent colors(?). Anyways, i am back using Nikon Scan with my Coolscan V, 14bit, turned off color management, set gamma 1.0, using digital ICE and all adjustments turned off. Set Analog Gain to Green 1 and Blue 2, this gets rid of the filmbase orange color (makes it white), scan the complete scanarea without doing previews and save as NEF.
I noticed NEF gives better colors. Processed it in Photoshop with another program and hardly had to do any postprocessing on the colors, just did curves and contrast or some gamma exposure and i am done.
As test, I used the NEF file with NLP to compare but the colors were washed out and had to do adjustments. Anyone tried NLP with NEF files?
Update: with Linaer - Gamma and Kodak the results are better in NLP 
Update2: no longer saving NEF, but TIFF for more compatibility.