M2 or M4 if you're using 35 & 50's, M2 has manual reset frame counter, 35/50/90 frames. M4 has easier loading, auto reset counter, 35/50/90/135 frames. Newer M's have IMHO cluttered finders. Might consider M4-2. Canadian made M4 w/hot shoe, no self timer, not much more $ than M2 great value for a user camera less interest from collectors so $tend to stay lower.