If I had the money to burn, I'd try out a 4 stroke, someday and probably after I've got 8 or 9 bikes with 2 strokes. These things are like Jays Potato Chips........Ya just can't stop at one!
It's probably a good thing, for me, to start with 2 strokes anyhow. Imagine how broke I'd be after building 8 or 9 bikes with 4 strokes! LOL