Replying to Yet another ski length thread

Hey guys, so after looking around the internet, asking people, and finding a lot of conflicting information, I decided to ask here.

I've got my eyes on a pair of K2 shreditor 102s, but I can't decide on length. My options are 177 or 184. Now I've read many of the other related threads, but haven't seen anyone close to my height/weight/whatever. Most of my skiing is done in Washington, I'm a little over 5'9", 170lbs, advanced 3+ skier who likes to go fast, jib around, hit twisty tree runs, pop off whatever i can, and occasionally hit the park. So maybe 65/35 AM/park. This ski is going to be for in bounds resort days to screw around on where I dont want my 179 pettitors. Now, I know that I could ski either length and be fine, but this will be my first "all mountain" ski, so id like some help deciding. Every other ski ive owned has been powder or park oriented. Any help is much appreciated