Thanks for your responses. I totally agree that the Seven Bike Company is excellent and I am very excited that they will build my bike frame. The other day watched a video it was spectacular to watch the craftmanship. It will be great to finally have a frame that fits properly.
It seems from many of the responses that butted frame and straight gauged are very similar/ in performance for a non professional average weight rider. It is interesting that 75% of the ti frames are butted, wonder if these are light weight riders under 130 lbs. or racers . I am not a professional rider nor a racer so maybe the straight ti gauged would be fine and could put more towards a nice pair of carbon aero wheels.