My tourer is a 1969 Magneet Sprint:
Derailleurs are the old, early 70's Sun Tour combination: V-GT and Compe-V front with the rachet handlebar shifters. Yeah, they're a little heavier than some of the suggestions already made as they're entirely steel. However, that rear is strong enough to pound tent pegs, and on a loaded touring bike weight doesn't mean ****, reliability is everything. The crank is a Stronglight 99 triple, which I really love. About the only thing I'd warn you against is the Weinmann centerpulls. They're ok, but you can do better under load.
You're going to find that there's a rather strong school of thought that nobody has ever made a better touring derailleur than Sun Tour. I have a difficult time disagreeing with that sentiment.