I consider myself an intermediate level player. I have used Nano Power 1600 and I have used Kevlar 3500 and Wilson TI Power Out of these three I liked the Kevlar 3500 the most.. maybe because its medium stiff and others are medium flex and that is probably why you feel the power in your shots with Kevlar.. recently I am thinking to order either Qiangli BG602 or Yonex Nanospeed 100? which one would you guys recommend? Or would you recommend anything else? I am trying to stay within $70.. Thanks a lot!