So I went to the AS. Didn't take too long to figure out which size iPhone I prefer.
I tried the SE, and while I really love the classic design and look, as well as how it fits super easily in my hand, I realized that, like I've known since I've owned my 6, I can easily one hand it as well. So why give up the extra screen size?
Next I moved to the Plus. Just like I anticipated, while I could reach the top corners of the screen with my thumb, it was a stretch, and in some situations would be impossible to reach. Even holding it in one hand just to scroll through stuff, the plus felt cumbersome and I could see it just "getting in the way" in everyday use. I could even tell my thumb felt slightly stretched after using it, so I know that it just wouldn't work in day to day use for me.
The 4.7" works best for me! Not too big, not too small! Will definitely be getting a space grey 128GB iPhone 7 when it comes out!