I currently have a Wilson Hyper Hammer 6.2. I broke a string and tried out a friend's Wilson with a larger head size. It definitely gave me more power and I'm thinking of changing to a larger head size. The Hyper Hammer is 95 square inches. Don't want to spend too much and I've seen the Wilson Nano 7 (110 square inches) and the Wilson K-Sting (105square inches) both very cheap. I have a single handed backhand. Does anyone know much about these racquets? Would 110 be too big?