@Rob Allen if affordability and a decent job market are important considerations, Darby probably not the play for you, Housing market is even wonkier there than it is in many other areas as it has experienced a “Yellowstone” effect on top of everything else.
if you continue north up the bitterroot you will have more options and bit more affordability closer you get to Missoula. I noticed Helena area is not on your radar - that might be worth a peek depending upon spousal acceptability factor
Good luck/tight lines on the search.