I'm a budget-conscious Leica-shooter, and use both an M2 and M4-2. The M2 is the nicest camera I've ever used. Nothing wrong with the M4-2 at all, just doesn't have that feel. I don't like the M4-P, M6, or M7 due to their busy finders. As an eyeglass wearer myself, I also can't see using an M3 (I also like to use 35mm lenses).
I think the stories of M4-2 problems are greatly exaggerated. I've had two, and they were both fine (sold one to get the M2). My M2 has the rapid loading deal, which makes it easier to load than the M4-2, at least to me. The take-up spool feels more solid and definite than the tulip. The rangefinder patch in the M2 is contrastier to my eyes than anything that came after, including a new MP I looked at a while ago. I also prefer the knob wind of the M2, but that again is totally personal. The angled wind crank of later models is the weakest point of the camera in terms of durability.