Replying to One ski quiver?

Went in to my local shop today to have a look around for a ski that will be able to rip the groomers and the park.I like both the Line Chronics and the K2 Extremes. I'm 5'7"ish and 145-150lbs. So I'd probably get the 169 in the Extremes or the 171 in the Chronics (they also have the 166, but i hear line skis are actually shorter than measured). I can get really good deals on both. I've heard great things about the Chronics, cant find as much info on the Extremes though (only that they are a bit heavier). Tech in shop says he has been getting great feedback on them though. Opinions?