I'm 6'0", 165-170 lbs. I train in the Adidas Adizero Boston 2 and Marathon 10. I used to race in Mizuno Elixir 3 (last pair is toast) but I've gotten more efficient/neutral and I want to try a more conventional racing shoe. I'm looking to get something a little lighter. Our local running stores carry very limited stock for racing flats/shoes so I'm ordering online. Any help would be appreciated.