If it comes to Omaha, I'd be buying season tickets. If it's in KC, I'll make 4-5 trips a season for teams I want to watch.
If the expansion is Seattle and KC (Omaha) I would assume both will be West and force Memphis and NO to the East, where I think they more naturally belong. And with NHL doing well and NFL not too far away, I think a dark horse NBA city is Vegas. That would bump down KC/Omaha on the pecking order.