I'll second the uncoated Leica Elmar 4/90 with Ltm/M adapter you can't get more old style than that. One of my favourite lenses. great for portraits and one stop down sharp enough for most work. Probable the better option for general photography is an old elmarit 2.8/90 from the late 50's to early 1960's they can be had for under $300 are superb lenses and still have a slight old time look and they are native M lenses.

Dominik