From personal experience, and you being on Colorado roads like I am, I would go with either a Rancho 9000 or ProComp's MX6, both are an adjustable shock. Or even a set of Bilstein 5100 series. All of three shocks are going to run you around $100 each, but they are definately worth the money. I ran a Rancho lift with Rancho 5000 shocks for years and about 2 years ago, I bit the bullet and got myself a set of RS9000s. I absolutely love them now. The ride is much smoother, I can take a washboard road at 30 mph and not even feel it. The problem I ran into with the shocks I went with is that the for the rear, they didn't end up fitting correct (the eyelets were too small on top and too wide on the bottom) and I had to cut mounts off and build my own. BUT, you can call any 4x4 shop that deals with suspension lifts and they can get you the correct shock for a Bronco application. I definately would not go with the RS5000 or lower or an equal ProComp shock. Yeah, they are pricey, but if you drive the beast every day, you will kick yourself for not doing it right the first time.