Krosya
Konicaze
I'd go for speed, too -- but more of it. A lot depends on your style of portraiture, too.
The 85/2 Jupiter is a great portrait lens at giveaway money IF you aren't looking for super sharpness. (Cue howls of agony and rage from those who say it's as sharp as the latest aspherics...)
For maximum sharpness at minimum cost, 90/3.5 Apo Lanthar. For more money, more speed and more sharpness, the 90/2.5 Summarit.
There are lots more choices but those are the extremes.
Cheers,
R.
I'm sure Roger was talkng about me as one of the say that Jupiter is sharp. 😉 While I do NOT say that it is as sharp as some ASPH lenses, if you get a good J-9, it will give many lenses a run for their money. Check out my thread here:
http://www.rangefinderforum.com/forums/showthread.php?t=88444
and tell me that it's not sharp or has nice bokeh.
For about $100 you can have a superb lens that is f2.
M-Hexanon 90/2.8 is another, and just a little slower superb lens. Have this one too and like it a lot.