Welcome to CO. You asked a very difficult question. There are so many places that you can go that are very good. Check out the DOW website for all the statistics you will care to see. Pick somewhere that you want to go and then check the stats for that area. Spend some time there over the spring summer and fall learning the area.
http://wildlife.state.co.us/

good luck!!

Like Peanut64 said,
look at the stats on the different units and then find the ones that have the most public land. It takes a long time to find a good area that is productive each year but they can be had, at least I have found them and then I open my big mouth and then everyone and their grandmother goes to it and then I'm looking again for a spot that's good without a lot of pressure. Let me know when you find a good spot, so we can get the word out, Oh! there I go again.

Hello, new guy on the block here . I have the Big Game CD from the DOW and the units that have over 80% chance success are units 201, 2, 1, and 10. But, the minimum preference points needed to draw a tag is 13!! The average bull in those units is 305!! with 340's and 370's around.

The best thing to do is find a place to hunt that is over the counter while you are building the preference points to hunt those units. You will get many seasons under your belt in the OTC unit before you will even have a remote chance at a tag in those units.

lots of good places just sit and spot might find a big un

Like everyone else has said thereis alot of place in Co to hunt elk...but I think the overall best places are in the northern and NW part of the state!