I'm just speculating here, but with a 66" wing, and judging from your experience, I would say that an OS 91 will fly it in a way that you would be very comfortable with. It won't give you unlimited vertical, but it will fly it very nicely.

An added benefit is that later on, there are TONS of planes that the 91 will fly extremely well, without eating you alive in fuel costs, and most 90 size planes transport easily.

So a lot boils down to - What size planes do you want to be flying 5 years from now, Big 120 size, or medium 90 size?