Try the EMBA at University of Texas--Arlington, or the full-time MBAs at University of North Texas or Texas A&M University--Commerce.
Good suggestions, Duncan.
With seven years of experience, you're sort of in the no-man's land between where you qualify for an MBA and where you qualify for EMBA programs. If you waited another couple of years, you'd be eligible to apply for some of the better EMBA programs in Texas, but as it stands right now the Arlington EMBA program - and perhaps the McCombs EMBA program - could work.
With the McCombs program, though - you'd probably want to bump your GMAT score up a bit. It sounds like you stumbled a bit on the first try - so why not give it a second shot? If you could land 600 you'd have more of a chance at some better programs.
Just FYI, you might talk to your employer about your plans - they might have funding programs in place for people like you who want to pursue business education. Or, they may have a relationship with an executive education provider that you could leverage. Just a thought.