I agree with Davidagar, there isn't much difference between a 4-stroke and a 2-stroke. If you want one go ahead and get it. The only thing I would recommend is to get a tachometer at the same time. The reason for this is that a 4-stroke takes longer for you to get the hang of tuning it by ear. On a 2-stroke the RPM changes are pretty easy to hear and pick up, but tuning a 4-stroke can be a little bit more subtle. The tach will help you to tune the engine until you get used to it. After awhile of using the tach you'll be able to pick up the changes easily.

I agree, there is nothing that sounds sweeter than a 4-stroke engine!!!

Ken