Dear loadupscott,
I think you have really strong work experience that will work to your advantage if you put your applications together right. While your GMAT is on the low side, I think you will have to look at where it falls in the mid-80% range for these schools. If you are in that range, but below the average, then it is more of a risk. If you are at or above the average GMAT, then you are in a good position. Nevertheless, if you have only taken the exam once and know you can do better, then you might consider retaking the test, especially focusing on the quantitative sections.
Good luck,
Lisa