Your GMAT is fine for the schools you mentioned.
It will come down to how well you execute the actual applications - essays, rec letters, resume and interview. You've chosen a good mix of schools so you should be able to get into at least one of them (barring any bad luck). Biggest challenge is trying to justify why you need an MBA if you already have a masters in a related field.
Alex Chu
alex@mbaapply.com
www.mbaapply.com
http://mbaapply.blogspot.com