Based on your raw goods alone (quality of work experience, grades, "average" GMAT score which I assume means in the high 600s at least for the schools you're targeting), you should be competitive for the schools you listed -- it will come down to how well you execute your written application, how well you interview, and a bit of luck. You should be fine.
Alex Chu
alex@mbaapply.com
www.mbaapply.com
http://mbaapply.blogspot.com