Scanning 35mm negatives - need some info?

I have just bought an Epson V700 and am still experimenting with it to see how it handles various film sizes ( 35mm; 6x6; 6x7; 645 ); this is a flat bed scanner but needs the film holder to hold the various sizes of both negatives and transparences in my collection. I have managed to scan 35mm images at 6400 dpi as 48-bit colour with acceptable results - see my contributions on Railway Herald galleries for examples of recent work - especially the Class 50s at Carlisle which were taken in 1970 and were scanned last month to generate the first printed image saince exposing on film. The larger format images are scanned at 3200 (else the file gets too big for memory) but all of the scanned images are resized to 300 dpi as first task before applying crops and further resizing.