I whole heartedly second both 3DFanatic and Montague's suggestions, Master Airscrew props have not treated me well (noisy and need balancing attention), I and a lot of my club are fans of the APC. Less noise and more thrust in the same size, perhaps not more rpm's but to paraphrase Eric Clutton Propellers fly planes not flywheels.

"If RPM flew airplanes we would fit (mount) flywheels instead of props" -Eric Clutton

Cheers!