Hello All -
I'm not adding fuel to a fire as I think everyone is right about the idea of experimenting w/props to find the right one for you. that's just all around a good idea and a great way to learn. From my experience with props and motors I've found this:
More often then not we rc hobbyists overpower our aircraft to perform unrealistic as compared to real aircraft (i.e.
brett65's comment on unlimited vertical). this goes for both engines and props. I've overpowered some of my birds; guilty as charged! Yet, often times I've realized the manufacturers specs for both prop and engine/motor are set to obtain 'equal' performance of what the real world aircraft would do. I guess what I'm saying is that if your classic yellow Piper Cub can't maintain inverted flight - there's probably a reason behind it.
I've found flying more realistic is way more complex and hair raising for me vs. flying completely over-powered. And then there are times when going completely over-powered is just plain fun....