Hi Josh
This may be a more subjective question, but my vote is for responsive. Even though you don't have a high volume of traffic today that is mobile, it will most likely increase and when you have a mobile-friendly page it will most likely accelerate. Some companies still go with stripped down mobile sites, but I have been seeing more people moving towards responsive to minimize the need of managing two separate sites and being able to give their mobile users as much content and functionality as possible.
Also on April 21st Google is going to start giving more preference to mobile sites. You can read more about it in the Moz article - http://moz.com/blog/9-things-about-googles-mobile-friendly-update
Hope this helps,
Anthony B
Biondo Creative
biondocreative.com