At your height and weight, I'd rock the 179s. Especially since you want to ski park a bunch. When you ski other terrain, you still have the rocker and the 102 waist working in your favor.
Most people will disagree on NS, but centermount doesn't work the best for everything. BUT, you won't be on a Schizo system, so..something 5.5 forward would be sick for park AND pow.
And yes, they are super fun. I don't ski anything without Rocker on it now. You'll see:)