I'd go with the .32,
Weight is very important with this plane. Mine has a Norvel Big Mig 25. Total weight is exactly 3 pounds. It is very vast, be carefull with the rudder linkage. As designed because of the control linkage to the rudder it starts to flutter when you get much over 100mph. I went to a plastic tube in tube type control and this ended my high speed flutter.
Tom