Just to make sure I got this right. the Satio is a 4 stroke engine tha produces more torque then the SuperTigre 2 stroke engine.
That is correct. A Saito .91 4-stroke would work while a Saito 1.00 would give you a little more power. You could also fly the P-51 Miss America with a Super Tigre .61 ABC 2-stroke engine, or select the Super Tigre .75 ringed engine for more oomph.
The 4-strokes will give nice "scale" flight characteristics and sound while the two-strokes would offer faster flight performance. The engine you select should be reflective of how you'd like to fly the plane.