First, good luck on the job. Second, Ogden and Utah in general is nice but I -love- Colorado like only a convert can. Below is some things to keep in mind.
The climate is so different that if you haven't lived in a dry or high climate there is no compairson. The Denver Metro is fairly flat, though not as flat as Florida. If you're from FL you will be sucking wind for the first month to two you're here because of the altitude difference. Centennial is like most any other suburb of any other major metro area. Keep in mind, close in suburbs will have more air pollution. A major concern in the Denver area. Farther out you'll have to deal with more weather effecting the roads.
If you don't have at least 4.88's in your Jeep, you'll want to think about go ing for smaller tires or swap gears because of the loss of power at altitude and if you plan on going into the moutains. As a compairison, I've got an Auto with 4.10's on 31's and am debating 4.56 or 4.88 when I go to 33's. But I live in the moutains, 3k feet above Denver.
Smog check is done by what county you live in, not the whole state. The largest tire they can fit on the dyno is (I think) 35's. You won't be able to register it in smog county with out a dyno check. There was a thread on it here not to long ago. Fender flare seem to be entirely optional, though recomended just for keeping the road smutchz off your windows in the winter. I haven't heard of folks being hastled for bumper height, and there are some big trucks out here.
Hope this helps. I'm sure some of the locals will correct me where I'm wrong.
