Can't go wrong with the FD's. I have two. 24mm and 55mm. I also recently got a Pentax Takumar 50mm F/1.4 that I need an adapter for that I'm expecting will look pretty good as well.
MD is clear winner for me. I got some MDs here, - they have less milky image than fd and better allround image quality. Look at the nikkor 50mm f1.7 - its a gem and dirt cheap! really nice creamy bokeh. love it :) also get adapters for md to m43 on ebay china ;)
It looks like you're new here. If you want to get involved, click one of these buttons!