RE: PROP CHOICE...2 BLADE vs 3 BLADE?
Blade choice is a personal thing. All I can do is give you my thoughts and experiences
For me and for flying IMAC, a three blade works well. You do lose vertical on a 3-blade in most cases but on my planes, I gain smoothness in throttle response and slower down lines. All my planes are seriously over-powered so I can get away with a three blade.
If you are concerned with sound, a 2-blade blade can be quieter but also what the prop is made from also makes a difference. I've seen two blade props quieter than three blades made form the same materials. I run a 2-blade 30x13 on my DA170 when it's a really windy day but run a 29x12 3-blade at all other times. I can just about rip the three blade, especially if it's cool outside and that is why in wind I use the two blade, but I cannot get the 30x13 even close to ripping. I run canisters and I am actually a bit short on the header length so my engine is not breathing like it should.
It's a matter of load on the engine. Now if you are running stock mufflers, then noise is not going to get much better no matter what prop you use unless you are really really good at throttle management