I'm interested in purchasing a Summaron 35mm f/3.5 lens. LTM or M mount would work. If LTM, it would be awesome if it had an adapter, but not necessary.
The Summaron is certainly a nice lens but don't forget the 35mm VC Color-Skopar. I have used it on my M's and have been very impressed with it. The one I have is an LTM version.