I second the recommendation for a Packard shutter. I've been using one almost exclusively for the past year, and I'm loving it. Opens up a whole world of cheap barrel lenses, many of which are outstanding quality.
How far back are you thinking when you say "Classic"? 1950's classic portrait looks very different than an 1880's classic portrait. I have an older Schneider Symmar S 210mm/f5,6 convertible that has a very classic 50's rendering look to me; which maybe some people think looks "modern," but maybe not to others. These Schneider Symmars are usually inexpensive. HERE IS ONE
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