ORIGINAL: foresterxt
I was turning a PowerPoint 20x10 at 6600rpm, I'm not sure if that's good or bad.
Just run good oil in it and don't let the DA snobs get you down,
Each prop brand will give you different rpms, with my engine, (MT57), it spun a TBM 22x8 6630, and a Zinger 22x8 8000 rpm. The better props are worth it so try a NX or Xoar if you can get them, I'd start with a 20x8.
Try the lawn mower section of the hardware store, I use the Champion 8 heat range in mine.