Those are all good choices, they will just make for different flying styles.

You can fly the Hog with an OS 46FX, its just gonna fly like an underpowered trainer. I've got a OS 91FX on my new Hog, had a OS Surpass 70 on an older plane.

The 70 four stroke was fine, but marginal with floats. The 91 two stroke pulls it vertical for sure!

With the 91FX I had to move the servos and battery back, behind the fuse opening. You might have to do something like that with the 91 or 100.