I'm 5'9-5'10 and 155 pounds. I lap the park a lot but my heart lies in the rest of the mountain, if you know what I mean. I'm from NY.
I got the 169's last year, and they were great. I loved the ski, and I could make it do whatever I wanted to do. The one problem was this flatter section of the mountain during the springtime- I would struggle to keep my speed up in the slush because of the rocker being counter intuitive to the situation. Other than that, I was really happy with the skis. Their park abilities speak for them self, but these really shine on spring days because the BLAST through the slush without hesitation. Choppy snow too... these skis really kick ass in those types of conditions. Just know how to handle ice (if you have to) and you will be happy with this ski.
Now for the size, I plan on getting last years Domains again, because I had such a great season on the skis. But, I am going to get the 179's because even though I had an awesome time on the middle size, I can see the benefit in getting the larger size. The 169's noses cup my forehead like a good park ski should, but because of the design, a longer ski will help achieve even greater stability.
Sorry if I went too long, I just want to let you know how I feel about these skis. Bottom line is, if you were to get last years skis, get the 179's. I hear there's something different about the measurement this year, so I recommend getting whatever ski would measure like last years 179's.