Emaxx tranny or Revo Tranny

[whipcream]

Im sure this has been asked a million times. I was using the speed calculator to determine what motor to get and It kept telling me the rpms to achieve that were to high. Im using the standard 2.5 Revo tranny. Would I be better off with the Emaxx Tranny. I'm trying to achieve 45 mph. Im either gonna run the quark 125b or the mgm16018. Whats everyone opinions? Im totally new to brushless and I dont mind spending a little more to be completely satisfied.