Just some food for thought.
On Pow days I ride a pair of the old red K2 Pontoons in 189s (more like 192). I'm not really that big a guy (5'9 185lbs). I got a killer deal on these skis- originally I would have preffered the 179s, but now I am super glad I have the longer ones. Even though these things are soft, I can charge like a Mofo with them, because they are freaking huge and I have super strong enough legs to save my ass if I need to, (I can squat 450). Sure a stiffer ski in the same dimensions would probably be a better charger- but you mention tree skiing and I stop right there- you want to be able to turn in the trees, and on a big pow ski it's going to need to be somewhat soft to do that safely IMO. They are soft and have a ton of rocker for pow and trees, yet they are so freaking huge that they float over everything and keep you on top of crud and ruts and moguls (LOL) (if anything the softness helps absorb some impact too). Plus they are long enough to have a decent backseat and be stable at high speeds. Hucking cliffs is no problem, just keep yourself balanced. I had the opportunity to ski a good 6 days of amazing snow (and after it was skiid up too) in the past couple weeks here in CO, and I took them everywhere, from bowls to glades and tight tree runs, steep double black mogul runs to groomers- you name it, they did it. Weren't exactly a super fun ski on groomers, but any soft snow and they were sweet. Honestly the most fun ski I've ever ridden.
On that note- K2 has since come out with the slightly stiffer blue pontoons, and then the stiffer yet Pon2oon that loses the pin tail and gains a bigger tail- which may suit your needs for charging a bit better than the old one. Personally I love the pintail in the trees and like the softness. Either way you can snag a pretty good deal on them. Old ones and newer one pop up on ebay a lot, and I think I saw a brand new 13 on a online shop for $350 earlier this year, just have to look around.
Just my .02 cents. I absolutely love the combo of huge dimensions, rocker, pintail, and soft flex. Makes it a more versatile "pow" ski. Others might not. I haven't had the chance to ski many skis in this size range, but along with skiing a ton this year I've been able to really improve my skier ability and do some super hard and steep stuff. I felt confident enough going 40 m.p.h. through trees and glades that I wasn't going to die because my skis weren't nimble enough. All grins here.