An econ masters with an actual accounting background will prepare you well. You should consider retaking the GMAT in the summer or when you have extra time. It isn't necessary, but it would make a difference at the "dream" schools.
Your list of schools seems well thought out. I would suggest trying to apply this round and skipping the masters if I saw this a month ago. There are probably some applications you could get in if you wanted this year. I don't understand why Arizona is there. Indiana makes more sense. You could consider Purdue as a backup to work with Bagnoli and Watts.
UCLA seems like it is missing from your list. It has several good theory people and a few archival people as well.