K2 OBSETHED OR HELLBENT (2011)

Hello! I am reading the forum from quite a long time, but now decided to log in and ask a question. Thats my first post to hello to everybody!

So, Just want to buy another ski to my collection. Actually I have 4Frnt MSP 187 and Volkl Gotama (rockered) 194. I am looking for a ski that I can play around, in changing conditions (mostly fresh snow, drops, lots of tight and steep trees, sometimes open terrain and couloirs)
I am interested in K2 mainly because of the nice price.
But dont know wich ski will be more turny in tight trees, not only in fresh deep pow but also in not so fresh (well used by the other freeriders) on piste performance is not so important (I have MSPs that are very nice on groomers).
So what are + / - of 2011 Obsethed and Hell Bents? I am thinking about 179... will it be all right? not to short?
Wich will better suit my needs? When I go to the shorter ski will I gain in tight spots? and how much loose on fast long turns?
I am 187cm (6'1") and 72kg (158pounds)
I ski mostly east europe (tatra and beskid mountains) (lots of trees)
and all the alps range (from france to slovenia)

thanks a lot for your help! have a looooots of snow!
Peter from Poland