Many people consider the Master Airscrew and Zinger props to be quite good; for stirring paint.....

Zoar is possibly the best of the wood props, APC is highly regarded for 18" and under, (I use their 16 x 8 a lot on my souped up 20 to 30 size engines), then of course there are the ultra high buck carbon fiber jobs. (Not my thing, though they possibly would be if I were both rich and into competition flying of some sort.....)

I have an ancient wood Top Flite 18 x 6 on an Echo 24cc engine in my big Great Planes Fokker Dr1 Triplane. The whole package is a perfect combo. (Tachs at 7500 rpm's.)

AV8TOR