A Soma Grand Rando is a great 'gateway drug'. I've been riding mine happily for about 2 years now, and see no reason to upgrade anytime soon. Several others in my club also have them, either as budget randos, or currently set up as city commuters after having stepped up to full-custom for their main randonneur.

You could also wait for the new Velo Orange Polyvalent (v4?).

Beyond that and the Velo Routier, not really sure what is readily available.

Have you ever flipped through Raleigh or Bianchi international catalogs? Not sure if any are 650b but there are a lot of classic road / randonneurs that come stock with fenders, racks, etc. Some even with downtube shifting and non-aero levers!