If you want economy, then electric is not the way to go. The more you add, the more expensive it becomes. 3 cell batteries, over two cell batteries are at least 1/3 more expensive. Then consider the higher capacity esc to provide current for that higher power motor.

$$$$ Cha-ching $$$$

But, if you really want to go to more power, bigger batteries, higher current ESC, consider that you will be adding weight, which means more power than originally thought. And of course, the selection of power sources for that plane will all depend on the weight of the plane and what you intend to do with it. Always consider the old standard of watts per pound for either sport, performance, or 3D operation. The more power you want, the more it will cost.

Get the numbers for the weight and how you want to fly this plane, then come back and ask again. Maybe someone can give you a suggestion for how to power that plane.

CGr.