I also want to mention that I am at sea level, and don't think I need to over power my planes for elevation reasons.

I have a 12x4 wood prop on my .46 TT in my FunStar and it works fine. So I know I can go bigger on a .61 TT. Maybe a 14x4 or 14x5? The reason I don't want a 12 on the plane is because the Extra has such a big cowel, and would look funny with a little prop.

Here's the plane I have got....