Truth be told, so far there has only been one brand of prop that I have bought that have been consistantly well balanced out of the package.
I have had numerous Master Airscrew props (all styles) APC, Power point and Zinger.
I am now using Graupner props and so far (6 props ranging from 11x6 to 14x7) have not found an unbalanced prop and the preformance is top notch.