Replying to Suggestions on 07 PE Setup

Just for background, i'm coming out of (yes i'm going to say it on this site) skiboards. I'm debating making the switch to twin tips for this season since I just got a Threedom Pass to Loon, Waterville, and Cranmore and feel I will have more potential on twin tips.

I'm 5'11 155 lbs and intermediate skill level. Considering my background I was thinking that the 164 public enemy would be a good size, but the people at my local shop said 159, altho small, would also be an okay fit for me if I really wanted to go smaller so it would be an easier transition (altho they suggested 164 would be optimal for my experience/potential). I'm planning to do 40% trails/60% park with much more rails/boxes than jumps. I would pair my twin tips with Scratch 120 bindings.

Let me know what you think on sizing for what I'm interested in along with what DIN you would suggest (they would put me at 6.5 or 7 but I think that's too low). Thanks guys.