I like the Puch myself. They're reliable, simple to fix, stylish, easy to find replacement and performance parts for, and very abundant (compared to most other mopeds.)
My vespa grande is O.K., too. It's efficient, smooth riding, sturdy, and variator belt drives are sweeeeet! Today, I rode it downhill with the wind and it hit 40+ mph! Up the same hill going into the wind it would only do 20. Time for some airbox drilling and re-jetting...
I'd like to get a motobecane, though (or at least ride one someday). They're just beautiful looking bikes.