I think a touch of confusion is creeping in here or is it just me.
From the first post which identifies a requirement for a working 35mm camera for a photography class. As digital cameras come in a range of formats I have to assume that the term 35mm refers to a FILM camera. To my knowledge only Leica produced a hybrid ( Leica R8 and R9 ) and these are mega bucks machines so NO 35mm FILM camera can be converted to digital unless you have the resources available to the likes of NASA who had this done with F4's. Link
http://www.nikonweb.com/nasaf4/
The first critical thing here is to establish with the photography class is if the working 35mm camera HAS to be FILM.
If my assumption is correct and it has to be film, then the recommendations given stand, particularly in view of your budget. If digital is OK then I assume from your signature that you already have a D50 so your $200 can go towards a lens.
I will take a moment to clear up any confusion you may have over the F5, sensors and mp.
When Kodak started producing digital cameras in the 1990's they used modified Nikon F90 and later F5 bodies as the chassis for their cameras.
These cameras are digital ONLY. I have no idea how many were produced but relative to today they were
seriously expensive. Sassans comment re batteries and chargers is also highly relevant. Technology moves on so this is not current kit.
Don