I would start with the 50SX. The Saito will require longer landing gear to get the clearance needed to swing a 13" prop. The 50SX will need a prop that is 12" or less is my guess.

FYI -- TNT landing gear makes several taller landing gear versions for the SE. I have the 5/8" taller set, the tallest they make, on my SE and I love it.