U Can Do 3D/ engines
Dlmob,
Something to keep in mind is the weight. The Saito 100 is very light at 20 ounces. I don't know what the Magnum 4-strokes weigh. I think you'll find the OS 4-strokes are a little heavier than the Saitos. I've heard the Thunder Tiger 4-strokes are really powerful, but I think they are pretty heavy.