Knowing your goal is a good thing...........
In the two stroke world there are two conceptual ways to make power: Piston speed and/or combustion chamber volume. I am a piston speed type of guy, so I would be looking at a small bore with alot of stroke, or a big bore with not much stroke. The OEM Banshee config. does not support a bore large enough without extensive modification to make sense, so if you were to do just one thing, adding stroke is how to get the job done.