This post is only a month late , but here it goes anyway...
I would recommend the Yashica Electro 35 GSN. It seems to fit your requirements quite well. The lens (45mm f/1.7) is quite fast and sharp, and you can get these cameras from eBay quite cheap. The only downside to the Electro 35 is the battery - they originally used 5.6v mercury batteries which are not available here anymore (you can still get them in Asia). However, that being said, there are adapters available (Yashica Guy, Cris Cam, etc.) that will use readily available batteries to replace the original one. Some of these adapters are supposed to step down the voltage to 5.6v while others use 6v. I do not know if the .4v difference leads to any exposure issues: I have always used the mercury batteries but now I will have to look at alternatives.
Hope this helps.