Go ahead and put the 38 in her, you will not be disappointed....... I have one and I had an Evolution G26 in it and it did not have nearly enough power, it could not even hover. I'm in the process of putting a Fuji 43EI in her. You can never have enough power; call me crazy but all my R/C planes can go straight up like the space shuttle. There nothing like going to the field and pointing the nose straight up and keep on going up for as long as you want, and then watching everyone reaction as their jaws drop. If you want to fly scale, which in my opinion is boring as hell you can always fly it at half throttle.

BOUND_4_HELL
You can never have too much power, as you can always throttle back.