For regular sport flying, use an 11-6.

For 3D flying, normally I would say a 12-4APC or the 12.25-3.75APC, but for really fine throttle control try the 11.5-4APC. It revs up faster and gives you better, smaller corrections. Not quite as much thrust as the longer props, but I think you'll find it to be an excellent 3D prop.