The southern San Juans contain the Colorado Trail and the CDT.
A better place to ask for information might be the CT and CDT forums at Trailforums.com and the CT and CDT forums at Whiteblaze.net.
As far as maps go, I suggest the National Geographic's Trails Illustrated maps, specifically
#141 Telluride, Silverton, Ouray, Lake City
#142 South San Juan Del Norte
#144 Durango, Cortez