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/
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.
As a Taxidermist I look at hundreds of Whitetail Bucks every year. I know that I have seen many different ways people judge the size of racks on live deer. I think for the most part they all are pretty close. I'm going to give you some measurements that I have noticed being right on in just about every deer. We have used it in the last couple years and have only been off by about 5-6 inches. We do study the deer while bowhunting so we get a little more time to look at them....