Find this book and get it in your hands before your trip. It's the most complete Colorado trails book you will find and is what we in the state use to plan our trail runs. Not only is there great descriptions of the trail, but waypoints, points of interest, and where the camping spots are. You can get it from the Funtreks.com site,
Amazon, or Books a Million and Barnes and Noble can order it for you. Should be able to get one or two day shipping. It only covers the area south of I-70, there is a "Guide to Northern Colorado trails" book too--so if you go north, you may want to get both books
Guide to Colorado Backroads & 4-Wheel Drive Trails (2nd Edition) [0-9664976-6-X] - $14.97
http://www.funtreks.com/index.php?m...s_id=2&zenid=20d07d2fe2be61d018807f8ea73fd576
Also go to Traildamage.com and click the trails tab in the heading, this will give you a good idea of what is out there, but for me, not as good as having the Charles A. Wells book in your hand.
Be careful, a lot of the trials that go above 10,000 feet still have a lot of snow on them, some are completely snowed in, and getting stuck out here can be a matter of life and death. I assume you'll have sleeping bags with you, also carry lots of water, (it helps with elevation sickness as well as being a life saver) a box of granola bars or something similar, and always have something to start a fire with. I recommend you at least have a hand winch or come-a-long with you if you don't have a winch, a come-a-long has saved my skin numerous times.
Hope this helps, have fun.