[Jeff Higgins]

If you look at the dyno charts, you will notice that the two more powerful engines don't give up anything to the lower power engine down low in its power band. They make more power across the board. They do not appear to be "peaky", sacrificing low end power for their improved power higher in the rev range. In light of that, I would go with the most powerful motor. You don't have to use it, but it is there if you want to use it.

I would also be quite interested in the differences in internal parts. Cast vs. forged crank, pistons, and rods, quality of valve train components, etc. I would assume the more powerful motor uses higher quality parts in those areas. I think that would lead to better longevity, especially if you hardly ever push it.

Anyway, I would rather have it and not want or use it than someday want it and not have it. There isn't much of a price difference to get the better equipment today, but it would get spendy to try to get there tomorrow from a lesser starting point.