When you say "more performance" what do you mean? More speed? More power? There are different props for each. If you want more speed then you want a higher pitched prop. If you want more power (basically means more pull going upwards) then you want a lower pitched prop. Going with a larger diameter prop isn't always good. You will get to a point where the prop is overloading the motor. You will want a prop that still lets you get enough RPM's to be within the manufacturers specs for the engine.

Unfortunately (as said above) props vary depending on the plane and motor. What works well with a motor on one plane may not be good on another plane. The best way to find out is to get several different props in your choice range and try each of them to see what suits you best. Ask other pilots at your field and see if you can borrow a few props to test with, that way you won't be out the money just to test a prop.

Hope this helps

Ken