Replying to Atomic Punx

Im looking at getting the 2014 Atomic Punx skis but I'm not too sure which size would be best. Im deciding between 164 and 170. They are tip and tail rockered which makes me think the longer ski might be a better option. Right now I ride a 171 but I find it a bit long when doing rails but really helpful for landing large jumps. The 170 Punx goes to about my eye brows and the 164 is just at the bottom of my nose/lip.

What size would you say?