After trying the Leica M6TTL and M4P for a few years I switched back to SLR with the Nikon FM3A. While I loved the Leica feel and mystique (which I totally bought into) with the truly outstanding lenses - there was something missing in my work. The FM3A may be a bit noisier, but in my experience it draws less attention than the Leica - your mileage may vary.
It came down to the close focus capabilities of the SLR and personal taste. I find I get a larger percentage of good shots with the FM3A. I had owned an FE2 back when I was a high school photog in the 80s and still have a soft spot in my heart for the song "Kodachrome...."
I bought the camera new from Adorama and picked up a 24/2.8, 35/2, 105/2.5 and 180/2.8 on eBay - the whole package cost less than I sold the M6TTL for. Maybe the kids will go to college after all.
Best of luck - the FM3A is truly a great camera. It is rugged, film is easy to load and Nikon AI/AIS lenses are excellent in real-world use.