Hi did you find a trade yet? Are you still interested? I have a user condition M3 SS that was serviced by Youxin Ye in Massachusetts on April 29 2014.
If your interested let me know we can exchange some info about our cameras.
I like M3 better than my M6 for 50mm not only because of magnification, but also because 0.72 viewfinder lines for 50m are very imprecise. I measured with focus on infinity and with nikon F3 who has 100% finder:
with M3 frames you see more than 95% of what you get on film, with 0.72 finder (M6) you get around 80% what you get on film. Framing with 50mm lens and 0.72 finder is just bad.