IMO the carbon avenger is a great one ski quiver for lighter skiers (I'm 165, 6') - Real Skiers liked them better than the Ti for most folks, and my very limited time on them out west (1 run) suggested they're a nice all-around biased toward the frontside, can be bent into various turn shapes, excellent grip for the width, little more lively than some new Rossi's. Not for maching crud, but I don't think that's what you're asking for. I've owned the XRC 1200's, I believe a slightly stiffer version of your 1100's, have a hunch these will be a definite improvement on softer snow, in bumps, tighter spaces, wash on normal groomers, not as good on ice. FWIW this is a good deal if they're truly in nice condition, otherwise nothing special.
Counterpoint: Not really wide enough to excel in Utah powder, although the flex is what you're looking for. An alternative would be to keep your 1100's (which won't get you very much if you try to sell them), and get something in the high 90's. There are several skis like the Watea 98, Blizzard One, and Line Prophet 98 that would be more fun in the trees or bowls. All three (well, the One could take some searching) should be available at nice prices within another month. So some of this depends on a) if you plan to keep the 1100's for hard days, and 2) if you want to move yourself more and more off the groomers or if you just want the capability once in a while.