Not an M3 for me, (a) because I like 35mm and (b) I don't like the weird round corners on the 50mm frame on the M3. Nor an M5 because I just don't like it, though i now there are many M5 addicts. On price, M2. On features, MP. Otherwise, whatever comes up at the right price, in good working order.
You might find http://www.rogerandfrances.com/subsc...icaphilia.html useful, though it also mentions digital (you can always hold your nose and close one eye).