This is definitely something to consider. When looking at the units and hunts available, I would be looking at the harvest statistics for each of them. Although the CPW harvest stats are not 100% accurate, they have done a better job of at least trying to collect data in recent years. I'd also...
Like has been said, use your eyes to cover ground by glassing. You never know with Colorado, but the last few years the weather has been pretty warm still in 2nd season, meaning the elk aren't being pushed down by then.
Also, Corey and Randy dropped an Elk Talk Podcast about a month or so ago...