I agree with the above post, 160 and Moki 180 are about the same. A 2.4 will have possibly more power (maybe) and be much heavier. I run the 160 on a Perry Pump and a Mezjlik 18x8 and it has pulled a 14lb World Extra up unlimited. A 19x6 should be the prop with the best thrust and should turn at about 8400 rpm. 18x6 is slightly under propped for 3D. Not saying the 18x6 is bad but when I ran one it seemed to make a lot of noise and not go anywhere. 9000+ rpm is more fitting for pattern type flying imho.
Also, the Moki and OS I have both run on 16 oz tanks and get 10-12 min on both, very efficient.