M-lens on a Nikon will not focus to infinity. Voigtlander makes a few M-mount cameras that wont set you back more than a few hundred dollars - the Bessa R2 is cheap as dirt if you can find one. B&H has a used R2a (with aperture priority) for $400. If your comfy with full manual I'd wait for an older and cheaper R2 to come around. Voigtlander has a SERIOUS advantage over Leica in that the flash sink is 1/125 or better. Leica seriously sucks with 1/50sec. That extra stop can be nice if you want to play with fill flash in daylight. On that note The bessa does not feel like a Leica in the hand so just get an M6, keep it pristine (or buy a beater and just deal with it) and flip it at the end of the class. An M2 or M4 would also be on the list, with a handheld light meter. The shoe-mount-meters (voigtlander, Sekonic, Gossen) are quite easy to use once you get the hang of it. I like that you can meter with the handheld with your camera in the bag (or dangling around your neck which is almost equally stealth), set the camera without lifting it to your eye which is very stealth, pull it out and snap in about 3 seconds. If you are comfy with an external meter (will your class require to do this anyways? I find using the external meter forces me to pay more attention to the light, which is always good too - just a weird psychological thing I guess) you could also go REALLY old school with one of the 1960-70's era Japanese fixed lens rangefinders. These cameras have really nice lenses ignoring the $10-50 they usually cost. Considering the $10-50 they cost this is an extremely solid option. As an added bonus a lot of these cameras use leaf-shutters which sink at any shutter speed (even 1/500 sec!) so they open LOTS of options for flash in daylight. My facebook album "Wandering NYC 4/14-4/15" was shot entirely with a Minolta Himatic 7 that I bought for $15. I LaLaLove my M3, but the 50mm frames can be kind of hard to see with my glasses on. The lack of reasonable 35mm options is kind of a killer for me because 35mm is my normal.