Replying to K2 Seths vs. Prophet 100's

Having killed my trusty yet ancient X-Screams this weekend, I'm looking to get new skis. I ski about 75% big mountain (deep powder, chutes, trees, etc.) and maybe 25% park (jumps and pipe but no rails) at Alyeska with an occasional backcountry romp. Of course, in the spring, those percentages may be reversed. I have a pair of old Line Skogens that are sufficient for the park but suck out of it. I'm 6'1" 190 lbs. and ski fairly aggressively but am by no means the best skier on the mountain.

I'm looking for a ski that performs well in the aforementioned conditions. I'd also like a ski that is tough as shit and won't bust if I find myself surfing rock.

So I've more or less narrowed my search down to the K2 Seths (189cm) and Line's Prophet 100s (186cm). I'd also consider Head's Mojo 105 if they weren't $200 more expensive.

Thoughts?

(Also, is it possible to buy wide-brakes for my old-school bindings so that I don't have to shell out an extra $200?)

Many Thanks.