The APC is a good prop to go for for starters, also if you can find a wooden 13x6 laminated prop(cant remember the make) they are much lighter and still pretty good. I dont know if it is just me but the APC 13x6 doesnt have quite enough braking at idle for my liking. vertical downlines still look rushed.
I am impressed with Sprinks bolly 13.5x6. He gets better acceleration and vertical than me, but i think he is using coolpower 15%heli, whereas i am using Irvine contest 10%. I also think my engine needs more running in, and my new tank might be restricting fuel flow slightly. I have had just over a gallon through it now. I am looking to try one of those bolly props though and of course this 14x5N apc archies talking about.