If you looking to save money, go with a speed passion reventon pro esc combo with a speed passion 6.5t motor. Just watch your motor temps. Speed passion motors are very sensitive to heat. But if you want a good system that will be competiive and worth the investment go with an LRP Flow works team esc and an LRP motor or tekin gen 2 motor. I have used both systems in my b44.2 and you will be satisfied with them.