For most resort on-piste use on groomers/bumps, I prefer recreational skis around 76-78mm, unless there has been recent fresh snow under 12" or so, spring corn/slush, or I am spending more time off-piste/in trees--then something in the 88-90mm range works great for me. When there is more than 12" or so of powder, then the 100+ mm wide skis are coming out to play.