[gbanger]

Personally I'd go with the 192 as well, just remember that as Prop diameter increases , so does current draw (Amperage) so the trick is to get the thrust you need without generating to much current.
I had a Hacker A60 190kv in my Sukhoi 140, that weighed 4.5 kgs, I was running that on 10S with a 20 x 12 prop and it Prop hung at half throttle, you don't get better 3d performance than that!
You will get better bite on the air and acceleration on 10S will a bigger prop than 12S with a smaller prop.
Higher head speed is better for speed but not for 3D. With that said you have to do the maths on every build to get the package that suits your particular application.