You will definitely be happy with the TT .46. From experience, the magnums don't have that great of a throttle response. If you plan on doing slow flight or 3D you want a very good throttle response. I have flown a couple of airplanes with a TT .46 and from my own experience with them, they all have it (once you break them in good and get them adjusted right). also, i think the Magnum is heavier. <div>
</div><div>Since you are using an engine that is more powerful than the recommended, i suggest you strengthen up the area behind the wing TE. Using some Carbon Fiber will do the trick and keep it lite. </div><div>
</div><div>For Servo torque the Futabas will be fine. Even the Hitec HS 311s will be fine. Whichever servos you choose i recommend you use a 6 volt battery. I have read that the JR 537 will be fine on 4.8 Volt, but for a 3D plane, whether you plan to 3D it or not, you want all the torque you can get from your servos. 
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