sounds like a good plan! the guys that told you the golden knight was the same was wrong. for one thing, the 72 g.k. has the velocity stack. the standard didn't unless they changed it. and the g.k. runs cooler. the black coating dissipates heat better, which is important if you fly in florida, or somewhere hot, like maybe israel or something... I hover a lot of stuff on the 72 g.k. w/ a master airscrew 13-6 scimitar, which suits the engine well. now, I'm not saying the silver saitos are bad, I'm just a g.k. fan; currently own 2 72's, a 100, and a 180- all g.k. the 72 is great on something extras and omp 540's, and my profile ultimate with a scratch built fuselage.

on the 46 on a 4-star, I'd try an 11-5 apc; big enough disc to hover, and still move it along pretty fast. that's what I'm running on my seniorita, and have used on most of my 2-stroke mid sized planes.

again, that's just what I do, hope it helps!