I have a evolution 16x6 on mine now, on my last one I had a Master Air Screw 16x8 and 16x6. I switch over to evolution props once they started making them about 2 or 3 years ago, they have been working good on the GP so I have not changed. APC is a great prop to that does not flex, I have only used APC once on a Seagull Edge 540. Wood is a great choice but if you have a prop strike most of the time they break, which is good because it lowers the chance of damage to the engine.

As far as parts, I would say just get a extra set of wheel pants.