Jim, are you looking for day hikes/climbs or one long weeklong backpacking trip?
Some of my favorite overnight climbs adding on 14ers and 13ers are Chicago Basin in the San Juans (4-14ers and a few 13ers) and the area near Wilson Peak/Mt Wilson and El Diente also, those are all Class 3/4 climbs though with loose rock.
For a backpacking trip the area around the Maroon Bells is beautiful though some of the peaks there (Maroon Bells, Pyramid, Capitol) are not to be taken lightly as there have been multiple fatalities on them this summer alone. The hike and climb of Snowmass Peak is a beautiful area (22 miles/6000ft gain) which you could do in 1-3 days.
For more Class 1/2 peaks try stringing together some 14ers in the Sawatch Range in the southwest central part of the state. You can pick up the Colorado Trail here also. There are over a dozen 14ers around there.
Also, closer to civilization RMNP has some nice areas also.
You could also go into the Sangre de Cristo Range and hit South Colony lakes th and climb the Crestones (Class 3/4) /Humboldt, and climb over the pass into the area under Kit Carson and Challenger peaks - more rugged terrain though around there for sure.
Lake Como makes a nice campsite and there are 3 14ers there, Blanca and Ellingwood are nice climbs, Little Bear a bit more tricky, especially without snow to hold in the loose rock.
