hmm, not sure about the premise. not better, just different. resolution will be similar, digital a lot less noise, probably better color with film (dpends on film). film gets grain, which can be a plus or a minus. both are great.
if you really want better as in better resolution, go for a medium format camera. now there you will notice a difference! (i am doing this now).
once you bother going into the difficulties of film with developing, scanning, etc, might as well do MF.
lenses with medium format (MF) will not work (for the most part). but then, depending on what you have already from nikon, they might not either.
any nikon dx lens is for digital only. that includes the kit lens from the d50, the popular 18-200 or the 17-55. most other lenses will work fine on both cameras, and any lens that works for film cameras will work on digital (actually, they all fit physically on everything - F Mount! - but the dx lens will not fill the film frame). so that depends a bit on what you have.
Edit:
oh right, and you question, yes any of Ns would be great, you also might want to consider the F100. film cameras, save the F5 and F6, are pretty cheap these days. I just got a great TLR rolleiflex MF used with amazing optics for $600.