If you can afford it, buy a Raptor 30V2 , it is a more modern design than the Shuttle Plus.
Easier to serve and more robust in a crash....
The chassi and mechanics are designed to handle the power of a 50 engine.
But the Shuttle Plus is not a bad heli at all!
It has everything that needs and flies very good.

Don´t buy a Futaba 6XH, it is not a full function heli radio.
The Hitec Eclipse 7, JR 378 or Sanwa RD 6000 Super
are much better medium price alternatives.