I do almost all my running on concrete (80-95mpw) and am looking for a lightweight but very cushioned shoe to give my knees a break on some of the easier runs that I do. I've managed to stay injury free so far but notice knee pain beginning to creep up during the end of the week. No doubt from running on concrete I'm sure. I currently use the Brooks Ghosts for longer runs and Brooks Launch for faster runs. Any suggestions??