Replying to Nimble powder skis?

For this next season I am wanting to buy some new powder skis that are good at skiing in tight trees and freeriding in general. I am about 5'11, 140 pounds and was thinking about getting around a 178 length but tell me if you think i should search for a diffrent length.
I already have all mountain/park skis so it would be perfectly fine if the skis dont handle well on groomers so the ideal width underfoot im looking for is about 120.
Also one of my friends is selling his 14/15 moment bibby pros cheep so any feedback on those skis would be appreciated as well.