Can't go wrong with the Bighorns. It's about the perfect tire for the front range as well as all of the Rocky Mountains. There is a reason that so many have copied the BH's. I have a set of 26.5 Rockers on my 850, but still have a set of BH's mounted on the OEM aluminum wheels. They go on every spring when I head out to Moab. NO better tire on the slick rock than the Bighorns. Rockers don't do so well out there.
Being that you are a Colorado guy, check out COATV.com if you are looking for a local ATV forum.