With the nearly daily closure of I-70 through Glenwood Canyon, sometimes for over 24 hours straight, I'd say your route is the way to go. The only "real" pass is Tennessee Pass north of Leadville and it's a quite manageable pass.
US 50 to CO 9 to US 40 may be the quickest, but you'll have both Hoosier Pass and Rabbit Ears Pass to cross.
Make sure you have adequate fuel before you head north on CO 131. Not much along that road until you get close to Steamboat Springs.
Ken & Allison
2 Camping Cats (1 diabetic)
1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)