FWIW, the weight difference between the two Treks and the Electra Townie is nil.
I am having a great time with my new Trek Pure Sport. It really is a real pleasure to ride!
Now if I can get my wife (same problem Tom...My wife has never gotten over her fear of falling while riding) on a bike. I think the Trek Pure Sport (or maybe the simpler 3 speed internal hub Pure Deluxe) is my best chance of 'talking' her into trying. In the meantime, I am biking around having a grand 'ole time.
My bike is so comfortable, stable and easy to shift. It's almost like it was custom made for me and my personal needs and preferences.