You mentioned that you had two sets of Protons. Is this because you were particularly happy with them? The price on them is so much less than the Neutron I can't help but wonder how they compare. By any chance did you get to try both at some point?
I think when we were talking hand-built wheels some of us were thinking of hand-built local wheels. I agree we need to support our LBS if they are a top shop. Otherwise they won't be there any longer.
One last question on the Protons and it is a subjective answer. Do they feel light and responsive? It has seemed to be that wheels of the same weight can have different "feels." Some light responsive and alive and some a deadness. Does any of this make sense?