The Rascal is a gorgeous plane in person. One of these days I am going to get one, hopefully the giant scale. The .46-AX is all you need for the 40 size. In fact, I wouldn't go with anything else due to limited space in the engine area.

Another good option is the World Models Sky Raider Mach-1. No, it isn't the prettiest thing in the world but fly it once and you won't care what it looks like. They are super smooth flyers that can be gentle & forgiving or do some nice aerobatics. Mine would knife edge the length of the field better than a lot of other supposed aerobatic planes I own. The best part is touching on the mains, rolling out and dragging the tail skid then taking off again without the nose wheel ever hitting the pavement.

I also agree with RCKen that there really are no boring planes. I've learned to do all sorts of maneuvers from loops, snap rolls, stall turns, and harriers to hovering, walls, etc. You know what excites me more than any of them? A perfectly greased landing because that is one of the more difficult things for most pilots to pull off. Listen to what he is telling you and you'll save a ton of money and stress in this hobby.

Sticking with the OS engines is a good move. Nothing wrong with the Magnums of course. I've owned 3 Magnums myself. They can run excellent but might need just a little more effort. Nothing beats an OS for the combination of power, reliability and ease of use. If you ever want to try a 4-stroke, the OS's are just as nice as their 2-strokes.