Hello
I have an xtreme lite ARF with a saito 72.
Hovers at less than 1/2 throttle with both APC 13x6 (10000) and APC 14x4W (9500)
Unless extreme acceleration is important, I would say the saito 72 has plenty of power.
The plane is slightly less than 5 lbs. (2100g). Had to place the rudder servo in the tail for proper balance.

Jon