Be less than 400$?
If we are talking about used camera doesn't that depend on the condition of the camera?
I would consider the Contax G system for the Zeiss lens.
Even if I had to wait a little more to spend maybe a little more.
I did a lot of research on this topic and my shortlist was:
Olympus SP (great by all accounts, good lens, spot meter)
Canon Canonet Giii17 (good by all accounts, good lens, good handling, compact)
Konica Auto S3 (didn't like shutter priority, great lens, slick)
Konica Auto S2 (bigger, great lens, see my post above)
As someone suggested, in the $400 range you may be happier with something more modern, like a Contax G. But I find that a fully manual camera with a good built in meter feels so good in operation and yields so much control in your photography that it's the way to go.
Best of luck,
"There is a time and place for all things, the difficulty is to use them only in their proper time and places." -- Robert Henri
I have a Fed 2 with an Industar-61 52mm f2.8 that works perfectly. My only beef with it is the tiny area available for focusing inside the rangefinder. I took some photos with it that turned out pretty well and fine, but I have a Contax system with some good lenses now and so the Fed just sits there (looking pretty.) I could let it go pretty reasonable or for trade if it's what you're looking for.
Or you could go with that Konica S2 that davela just posted in the classifieds for $75. That's a good camera with a great lens from what I've read.