Treat your Internet Connection with the importance it deserves.  If the Internet is central to your operations, then maybe you should consider something more than a $35 router / firewall.

Your router should be able to tell you how much Internet you are currently using, or how much you used last month.  Some businesses need to external monitoring to know if the Internet goes down during the night.  

Business has changed.  Connection to the Internet is truley essential to many businesses. 

I'll show you a common sense approach to making it all work.