New prop: 2 vs 3 blades?

[gkey]

I know that within the next 2 years or so, my shop is going to recommend new prop blades. My plane has 2-blade props on the front and rear, and it is the rear one that needs attention soon.

I have a few questions, that I can't get answers for.
What are the pro's vs con's of 3-blade vs 2-blade props?
I know it's probably cheaper just to replace the props, but what about the hubs?
I think the 3-blade props are quieter due to less RPM, so does this mean I can get better perofrmance (speed, power) out of the engine with them?