Are you willing to work with an external viewfinder, or do you want something with 28mm built-in? If the former, the Leica CL is probably a good option (especially if you want a meter), as is a FED-2 (screwmount, though); neither one has a stellar reputation for reliability, but there are good ones out there. The CV Bessa T is pretty small as well, but I never warmed up to the design (and I believe it's LTM as well, not M). I second the recommendation of the CV 28/3.5 - I haven't used one, but I love my CV 21/4, which has a similar external design.