My assortment of small controllers that come with the RTF models is growing. And I am ready to go to a larger bird. I am looking at the Blade: 120SR, 200sr, 360, and 450. I am also saving for a P3. That being said, I want to buy a controller that will cover all these, plus maybe a model or three that are not listed. I have been looking at the Spektrum 6. I would like to buy a used unit. Which one could I get that would fly all these? I would like the bells and whistles, such as ability to fly SAFE mode ships, and a controller that has user friendly controls. I want to buy just BNF units from now on, as the controllers are spendy, and I don't need all them. If I buy, say the P3, or Blade 450, will the controller that comes with it be diverse enough to run these other models? Or would a #6 Spektrum controller be the way to go? Or should I spend the extra and try to find one better, that has more features?