I cannot comment on the quality of the Nikon Coolscan range, but if your concern is about the software, consider using a third-party tool such as VueScan

Well, there's the Canon CanoScan 8800F and it seems to have very good reviews and can handle negatives, slides, and photos. Apparently also comes with some good software for dust and scratch removal (assuming you need it). Added advantage of not being strictly a film scanner.

Another option is Epson. Epson isn't a photography company, but they are imaging and printing company and quite good at it. They have quite the range, including some very high end ones with an appropriate price tag. Again, an advantage is that it's more than film.

Neither of these options are going to be faster than the dedicated device, but then again, if you don't have the film for everything, the Nikon isn't going to scan them for you. By the way, don't be too quick to dismiss 4000 DPI. Such an image, at 48 bit color, is over 120 mb! It's over 60 mb for 24 bit and that massively exceeds any digital SLR on the market! Net effect, that scanner is going to give you all the resolution you need and none of the flatbeds are going to scan 4000 DPI at 48 bits in 20 seconds.