Hi cgisler,
I would agree with the other gmatclubbers, really sit down and evaluate what your career and life goals are.
For me, I was in a similar boat as you. I work at a great company that's grown and become fairly well known in our industry. That said, I felt there was still a lot more to learn and that an MBA would be the most direct way for me to achieve this knowledge and build the network and connections that would last a lifetime, what's why I chose to apply this past fall.
The question is also what if everything isn't as peachy at your company as it is now? What if management issues come up, or something drastic happens? What will then be your plan b?
At minimum, take the gmat diagnostic test online to see where you stand. That one's free