This isn't really an answer to the original question, but I wish I got into four strokes sooner than I did.

I guess the biggest advantage I see is the immediate throttle response, due to the higher torque of the 4 stroke. When you ask for power, you get it immediately instead of waiting for RPM to increase. There is less top-end power, but you can use a prop with a higher pitch so you don't need to go there.

The sound is great, it's really neat having a little engine with valves and stuff (i.e. the neat factor). My four stroke seems to make less of a mess than my 2 strokes, and seems to be quieter overall.