Sell 'em both and buy a Proto, IMO.
If you have one of the three, I don't think there's really much of a place for one of the other three. They're just too similar. If you want a quiver, go for boards that offer something more different from each other.
That was what I meant from a rebuild.. Getting outside the NS brand after picking up the Proto. I think I have an addiction to the NS line lol.... Regardless, I may lean more toward picking up the Proto and going to something else as another board (which would start up my next debate lol)..