That's good to look at everything, especially taxes. Montana does not have sales tax!!One thing to think about it state income tax, which Idaho and Montana have. Its far more expensive than out of state tags. We moved here years ago and now that we have kids, we are going to be heading back to Washington. The public schools here are terrible when compared to whats next door in Washington. I will second the observation that the area has also been flooded with new residents in the last few years and it feels over crowded.
I wouldn't pick the state you live in based off hunting seasons. There are a lot more important issues that affect your day to day life than some cheap tags in the fall. Unless you are single. If you are single and don't plan on changing that, money isn't an issue, and you get plenty of time to enjoy the outdoors, Western Montana gets my vote.