Taylor,
Thats a pretty cool design. I agree about personal preference as far as software goes....but i would rather not wait around for long render times....which is why i use VRay
Seriously though...radiosity isn't really a good method to use for exterior scenes. Not sure if you used the newer adaptive subdivision capabilities in the newer versions of radiosity in MAX/VIZ....this would help bring the render times down....as well as the type of image samplers/filters you may be using for anti-aliasing.
What are your machine specs that you used for that image? Any chance you would let me render that thing in VRay?
Dwayne D. Ellis