Probably half the 14ers in CO are within 3 hours of Denver.
All the Front Range, and Ten Mile and Mosquito, most of the Sawatch and a few in the Sangres are in range. I'd skip the Sangres, they're ROUGH. Some of the Front Range is either steep or long.
Ten Mile is nice. Lincoln/Bross/Democrat/Cameron is pretty sweet because you can bag them all in 2 days. They're not technical at all.
You could likely bang out more than one Collegiate Peak (Yale/Harvard/Columbia/Oxford/Princeton) In fact, most of the Sawatch range is doable, though it might be a stretch on the driving. Not very technical, unless you want it to be.
There's a wealth of trip reports at 14ers.com and SummitPost.org
See what you find there that you like.