Take a look at the Elk Mountain range. I did an Outward Bound course there (my intro to lightweight backpacking!) and thought it was wonderfully beautiful. There are a heap of peaks out there, the beautiful Maroon Bells among them. I think Snowmass mountain is the highest you can bag without getting technical. We only did something like 60 miles over 18 days, but you could definitly get a lot more out of the area than we did.
Here's a taste! For what its worth, these photos were taken from late June to mid-July after a low snow winter. The only ones I have on this compûter seem to be taken at sunset or sunrise...