The Jack Browns will measure right around 35mm @ 80psi on a CR-18 or VO Diagonale rim (same inside width). I've had two sets of the Kevlar version. They're nice and you can ride them at really low psi. I'll bet the non-Kevlar version offers an even better ride.

From all of the opinions I've heard (from riders' opinions I'd consider) I suspect the Grand Bois are the best of the three. As you are aware, any of the choices will be a good one.

What kind of duty/mileage will this set see? That would be a factor in my decision.