I would recomend getting master airscrew propellors. They don't shatter when contacting the ground like wood or APC props do. They really take a beating. They may not be a high performance prop but at this time the extra .004562 in effeciency doesn't really matter. I believe the 3 bladed props are harder to get and more expensive too. If you can switch to a two blade it would be cheaper but you have to be careful with ground clearance.

skeeter