Title says it all. I am 5'6" 137 pounds and 34 years old. I have ran 9 marathons so far and I hover around 2:35-2:43. The best marathon shoe I have had so far is the Asics DS Trainer but I am wondering if any of you had some guidance on a supportive but lightweight marathon racing flat. Something to race in but also do your long run tempo workouts with.