I have a hard time believing the wheels could be 4 lb lighter. Are you sure about that? For comparison, what average speed do you think you would have done that same route at with your old wheelsset? I recommend schwalbe stelvio 23 tires, that go up to 140 psi, and are a good compromise between low weight and flat resistance. you can get them for a good price at bike tires direct, and they do come in assorted pretty colors. Wheels and tires are sold separately. A rim will accept a moderately wide range of tire sizes. I run tires from 23-32 on the same rims as my riding conditions demand.