I've lived in CO for over 30 years now and can tell you that you're in for an awsome ride! If you had time to include the Ouray / Telluride area and the Rocky Mountain National Park you'd have hit most of the top rides in CO. But then again, you'll have a reason to come back.
I do have a couple of suggestions for some things along your route. Just outside of Gunnison on your way up to Crested Butte is an Italian Restaurant called Garlic Mike's. It's on the right and backs up to the river. If you care to, they have outside seating. Good food, reasonable portions and a local favorite. Of course your friends in Gunnison would know best.
If you find yourself passing by Marble, CO along 133, take a few minutes to ride on up there. It's about 5 miles off the road. The marble from this little area was used to make the Lincon Memorial. It's pretty bizarre to see huge chunks of the stuff just laying around the road sides and the town itself has some picture worthy sculptures.
A few hours soaking in the Hot Springs pool in Glenwood Springs can be a good idea, especially after a long day in the saddle. There is a Brew Pub in the Hotel Denver in Glenwood Springs where you can get a Growler of beer and a pretty good meal.
Enjoy your trip!