What ski should I get ?

If you're only going to have 1 pair of ski's, thats probably a good choice.

ON3P JMOS

Well if u r doing pow I would go armada jjs but since you are doing some park I would recommend the arv that might be a good ski for you, the armada ANT is in-between those, if you want to try something new I would look at the triumphs go on www.armadaskis.com and take a look but those would be my choice I know it doesn't narrow it down that much but u really need to say how much pow u r doin

Well, they gonna be my skis for powder days. I already have some T-Hall as park skis. So everytime I'll be going up for powder, alpine to trees, I'll use this ski, but I want it to be able to handle grooms  as well, thats why I thought about the obseth.

I want a wide ski, with the reverse camber technology, that can handle grooms and jumps, I won't use it on rails.

JJ's or Rossi S7

I'm now hesitating between the JJ or the Bent Chetlers... or the obseth..(I heard it may be too soft ? )

I want something mainly for powder...I mostly ski trees and bowls... I think the JJ would be better for tree skiing, but is it stiff enough to do big turns in bowls, to do clifts and such ?

I know the chetlers would be better for big mountain lines chute and stuff, but I think it would be too big to for trees...

and which one would be better for jumps ?

you could also go for the line sir francis bacon, ive heard its fun as hell and can hold up in any condition imaginable...