The 4' x 8' was a shopbot, although I don't know the model number off the top of my head. They don't sell it any more but the replacement was this.
http://www.shopbottools.com/mProducts/prSalpha.htm
I know that when we bought it, the list price was under 15k, and somehow we managed to get it for less. We also went for the spindle instead of the router because we cut aluminum a lot. It's used in all the tech classes in our school, including the electric vehicle class, where it makes the body panels for the cars.
It's the best purchase our team has ever made, and we're really happy with the results. By the end of build season, we have freshmen who have never heard of CNC before who have learned how to operate the thing by themselves.