So on an impulse I ordered a Lightorama CMB16D 16 channel DC board (http://store.lightorama.com/cmdedcca.html). This will officially bring my channel count to 64.
The CMB16D is a new board from Lightorama, it will not even ship until sometime in August. Other light control vendors including D-light Animated Lighting both have DC controllers and they look intriguing.
This controller will require a lot of extra work from me as it is not a "Showtime" product. I will have to supply my own enclosure, power supply and custom power cables, but I will be able to control DC based fixtures, including some awesome LED floodlights.