OK, given what you already own/like, where you ski (Sorry, but Utah's version of ice is what we call "firm," and your groomers are what we call "soft"), and what you'll be doing (ambassador?) I'd say a Kastle or Stockli would be overkill. These are both brands that tend to sing at speed, like a pilot who's going to be on them, have remarkable grip for all-mountain/mid-fat skis (what I assume you're after). Not they they can't do moderate speed noodling, but why spend those kind of $$? If you really want to, and the "quality" word = build quality, I'd think something like the LX82 or FX83, or the Stockli 78 would be what you'd prefer. Beautifully made, precise. IMO the FX83 is the world's best all mountain ski for groomers + stands of trees alongside.
OTOH, it's also a ski that only does what you ask, nothing more, nothing less. Not a push button, not what I'd call "easy going." Ditto for the other two. I'd be more inclined to go for something like an Elan Waveflex 78 Ti or Amphibio 82, Blizzard Magnum 7.6, Rossi Avenger 82 Basalt, that are calm skis that can wake up and handle stress and speed if you ask for it. If bumps and trees alongside the groomers are also high in your agenda, than I'd aim more toward skis like the Blizzard Bushwacker, Rossi Experience 88, Fischer Watea 88. They'll give up a touch on, ah, firm groomers, but be more supple in steep bumps and weaving through trees.
And incidentally, IMO your S3's are not too shabby for what you seek. No, they won't shine at speed on hardpack, but they're very versatile, lovely in trees and bumps, perfectly happy to carve at walking speed. The BBR's, from what I hear, may also be great if you want to let the ski do the work, enjoy the scenery while you talk with the tourists.