Replying to Line Chronic '09 - need advice

I am thinking of getting a pair of these from Untracked.com in the next few weeks, but I'm unsure of a few things.

First off I wanna check that these are the right ski for me - I have been skiing for 11 years and have only recently got into park skiing. This will be my first pair of twintips and I want them to perform in the park as well as on the piste and a little off it. In percentages, I'll be doing about 50% park, 45% groomers and 5% powder. Any other ideas for skis I could look at? Armada AR6?

Secondly, the length. After reading around the forum a bit I think I should go for 176... I am 6' and weigh 180lbs. I reckon the 181 would be too big.

And opinions on the Marker Griffon??

Anyway any responses are appreciated
Thanks

I'm new by the way :)