We don't know anything about the OP's skill set, which makes it difficult to provide a high quality response. In addition, of course, we don't know what the conditions will be when he goes to Utah.
A pair of 110+ rockers is a blast in deep fresh snow. Turns are easy and dependable, landings are solid, and they contribute greatly to fun and confidence. If your skill set isn't quite what you wish it was for deep powder, they'll let you cheat so you'll have fun anyway even though you're not accustomed to powder. And if you're already a good powder skier, the big skis will complement your skills and you can go wherever you want with assurance that you'll be able to do what you need to do.
Keep in mind that a pair of rockers will not instantly turn you into a powder expert if you weren't already a powder expert. They'll let you do more with more confidence than you could have done on your narrower skis, so in that sense the ski has made you a powder skier. But you still won't be skiing the lines that someone who developed powder skills on narrower skis can do on rockers, because that person may be doing outrageous lines they might not attempt on narrower skis. The rockers help, but a solid skill set helps even more. Combine a good skill set with rockers, and you'll rule.
One more point: I find that if I pop out of the trees after lunch and hit a soft, but skied-up run with moderate bumps, the rockers will do OK, but if I slap on the Mantras and do the same run again, it's more fun. (FWIW, the Volkl Mantra is sometimes accused of being a wide race ski and too stiff for powder.) The Mantras are livelier and hook up on the semi-firm snow underneath a lot better while cutting easily through the skied-up piles that used to be powder. And they still float on whatever powder is left. But that's just me. Your mileage may vary.
Originally Posted by tromano
Paradoxically, the better the snow, the less it matters what you are on. The more inconsistent, windslab, and funky upside down, the snow the more purpose built powder skis shine. $.02
This is true. Unseen dense pockets can abruptly slow your smaller skis that are running well below the surface even on somewhat dense windpacked snow. Your upper body, of course, wants to keep right on going, which can lead to face plants. Even if you don't go down, the invisible inconsistancy can cause you to ski tentatively or sit back at a time when a solid stance and willingness to drive the skis is most required. With a big pair of rockers, you'll glide right over such pockets.