Replying to How much wider to go on skis?

I'm currently rocking a pair of ON3P Jeffrey 108s. Likely wouldn't be too near in the future, but the thought of getting a more dedicated powder ski has crossed my mind. First of all, do I even need one? 108 plus the fat rocker on the Jeffs has definitely gotten me through some deeper days, but I guess I don't know what, if anything, I'm missing out on by not having a wider ski.

That leads me to the question of how much wider? 112 definitely seems too close to 108 to justify another whole pair of skis. Is 116 different enough? Is 120 too wide? I've definitely had some dreams about 120 bent chets before...

5'11", 145, ski would be used mostly at copper and telluride.