Boosboy,

Only you can make the final decision on which type of engine to purchase, but let me give you some of my experiences:

I don't believe four-strokes are more difficult to set if you have a tachometer.

A .61 four-stroke will give comparable power to your two-stroke engine.

Four-strokes hold a tuning better through density changes and use less fuel.

They "feel" better at lower than full throttle settings. Two strokes seem to be happiest going full bore while four-strokes give the same response through the full throttle range.

I would personally go with a four-stroke.