I'm a doubles player and spend a lot of time on the ball machine. I currently have two rackets that I use: Tecnifibre Tfight 325 VO2 Max Head Youtek IG Speed Lite I tend to use the Head when I'm playing against more crafty players who aren't hitting a lot of pace and I break out the Tecnifibre against heavier hitters or when I'm practicing on the ball machine. In short, I'm looking for something roughly in between my two current rackets so that perhaps I can use it all the time. I'm about a 4.0 and hit a lot of topspin. Any suggestions on sticks I should demo? Thanks!