You're going to be using a mid-continent hub a good deal of the time, and presumably you're going to want to get home at the end of the week, not get stuck at the hub owing to storms or ATC delays. Looking at your "territory" I would say you should either stick with AA for DFW or look at CO for IAH. I certainly wouldn't depend on UA/ORD to get you to all those far-flung places -- lots of medium and small cities involved, I presume -- from WAS. And I don't think US is relevant here at all, even though AZ is in your mix.