Living in Grand Junction we are pretty spoiled. One hundred miles from Moab and Ouray and slightly over that to the central Colorado mountains make one just want to go Jeeping all the time.
You guys have already mentioned some of the better ones in central Colorado:
Spring Creek, Pearl Pass, Taylor Pass, Radical Hill, Red Cone, and Red Elephant Hill come to mind there.
Ouray area:
Poughkeepsie, Black Bear Pass, Imogene Pass, Governor Basin, and Yankee Boy Basin.
But we have some on the western slope that will put a thrill in your day too. Some you will not have heard of before. One was closed (Mother Nature closures) for at least 8 years and probably longer.
Calamity Mesa Loop is that one. A 20-mile class 7 or 7+ loop is hard to find.
We reopened this one a couple years ago.
Pace Lake is another class 7 trail. It's only 10-miles up and back, but some great running. Another we reopened.
If those interest you, go to
On the Happy Trails for some stories of those and many others we consider "good".
Happy Trails