Upload & Sell: On
Unless you're using it professionally, I'd stay away from spending the money on an F5. I've got a used N80 ($60 on eBay in excellent condition), and really, the only thing I miss from my D7000 is the AF points. The N80 has 5, and so does the F5. If I could afford the film, I'd also miss the 6fps from the D7000, but yeah, the cost. That, in turn, reduces my need for other F5 features that I'd be using to shoot sports/fast moving objects. Beyond that, the N80 has a traditional Nikon DSLR layout, so you'll feel right at home from day one.
I also have an old Nikkormat FT2 I got for $20 off of eBay, which is fully manual and heavy as a brick. Works just fine, and I love the split viewfinder for focusing. So much so, I'm gonna pick a KatzEye one up for my D7000 next year.
The only real difference in film bodies are the amount of features (and the weathersealing). Technically, you can get the exact same image out of both the lowest and highest end Nikon film bodies using the same lens and film. Technology (ironically ) is what has caused digital SLRs to go obsolete so fast. This doesn't really apply to film SLRs.
And yeah, I bought the film cameras to hopefully instill some level of discipline in my picture taking instead of blasting away at everything with my DSLR. Since each shot costs money to buy and process, I'm much more stingy about what I shoot! I also like B&W photography, and it's hard to match the appearance of true B&W film in digital.
If I were you, I'd get a cheap film body and a flash or two. Both will help you expand your abilities more than just another lens. At worst, rent a lens if you go on vacation or something. Just get a small camera bag with a weatherproof cover for skiing, and bring whatever camera you want.