You might start off by looking at the Colo regs and draw odds?
The units you list actually take quite a few pref pts to draw. Some don't even offer tags to nonres. .I wouldn't exactly say there is an easy antelope tag to draw in Western Colo unless it is a private only tag or archery/muzzy. Most Western Colo rifle units take 10+ pref pts to draw as a resident and even more for nonres. (if they offer tags to nonres).
If you really want to go hunting you can do an OTC bow hunt. Eastern Colo where there is more private is easier to draw but unfortunately you may have a tough time finding a place to hunt...unless going guided.
If you want to go antelope hunting next year with 0 pref pts you may be limited to archery OTC? If you have 6+ pref pts or can find access on private land you have a few more options available.
Jim