Helen, IMHO the most elegant and practical shooting set-up is a IIc with a vintage 50/3.5 Elmar. The IIc has no slow speed dial in front to catch on things and it's really nothing you ever want to use on a tripod or with flash anyway... and a 1930s Elmar has a very different look, look for good mechanics and let the glass be as-is unless it is horrid. The IIc has a one-piece top, strap lugs, and diopter adjustment, and with Youxin replacing the beam splitter and doing a CLA for not very much money, you'll get a great shooter for years to come.
Loading can be frustrating at first, I like to remove the lens and make sure the film is running smoothly. If you can find one of the spring loaded spools they are nicer, watch the compatibility though.
Pass on the ridiculous 50/3.5 Elmar lenshades but get a couple of cheap push on caps. Get a nice Gordy's wrist strap and if you want, a film trimming template.
Nothing is wrong with the IIIf or Summitar except the Summitar is good enough to pass for a modern lens and the IIIf has a useless (to sane people) flash connection and some extra do-dads on it that annoy me. And they cost more! The IIc and IIIc are the best values, although sometimes the early post war models have lousy cosmetics because Chrome was in short supply. These are the best shooters because the guts are fine and they sell for cheap. You can always put a cameraleather.com Griptac covering on them and ignore the bubbling, brassing Chrome.
The way to use them quickly is to quickly shift left to right to frame and focus and back, they can be focused more accurately than Ms I think, but the f/3.5 gives you a nice margin of error too. They simply are not low-light cameras though.
Another nice combination, albeit more expensive, is a mid-30s black IId with a Nickel Elmar. No strap lugs but very lovely.
I see no point in trying to make them duplicate a modern camera, so I like gritty, grainy film and a real Butch look.
Of course I never wasted my time with such contraptions or owned a dozen over the years, I am just an armchair photographer who likes to speculate ;-)
