both of those will fly the plane nicely.
i have a saito 100 in mine and its a perfect combination.
the manual shows the plane built with a 91 OS 4st.
ive had mine about 6 months, several flights and enjoy it a lot.
use the low rates for intial set up and maiden.
http://www.youtube.com/watch?v=wk5KsNPalM0
this is a short video of the maiden takeoff recorded by my son
with his cell phone.