Hi Bird,
I like the closed throat #71 1/2, as my first choice. I still think the little #271 is also a good one to have on hand. Later versions of the #71 and #71 1/2 came with a guide fence. I've never really used the fence too much. I usually use my router planes free hand. I guess it all depends on the type of work you do.
I think all three models were nickel plated for the most part, however, those made during WWII were japanned (no pun intended). The nickel was being used in the war effort. I have both nickel plated and japanned versions and see absolutely no difference in their performance. From a purely aesthetic perspective, I like the nickel plated versions a little better. The japanned versions are a little more rare. To add a little history to the topic, all Stanley planes were delivered new in boxes. Early boxes were light green, while most later boxes were a yellowish to almost orange color. Planes that were manufactured during WWII were not only japanned, but many of their boxes (not all) were a more olive green to brownish color. It's just something I like to look for when I see a WWII era plane supposedly in its original box. Although it's very far from fool proof, the correct colored box can often help authenticate a WWII era plane.
Jim C.
