Afterbang help?

[Rictrok]

So I've already started thinking about next year's skis and right now I'm pretty set on getting a pair of line afterbang. The only problem is I'm not too sure whether to get the 177 or 166 length? I'm 5 foot 9 inches and weigh about 140 pounds. Can anyone help me out? I ski in wisconsin so jumps get only about to 50 feet at the biggest and i like to ski a lot of rails.

 

[BWalmer]

I'm 5'8" 155lbs and ski east coast in CT, I have 177s. I'd say go with 177 cause they'll be more stable for landings, it's a pretty soft ski so you'll want the extra length so you do wheelie out every time you land back seat, but that's just me.