Vyse - several national rankings list SMU's Cox Business School higher than A&M's Mays. See article below from businessweek.
Business School Rankings and Profiles: EMBA, Executive Education, MBA, Part-time MBA, Distance MBA
(Be careful and don't fall for some of the propoganda A&M puts out about having such a wonderful "aggie network" - it is good but no better than networks from other tier 1 universities).