My old 5x7 Elwood has seen me through to this point, but I think it's time to look for more rigidity and precision. I know that a used Zone VI comes up on ebay from time to time; what is the difference between types 1 and 2? Are there any other makes I should seriously consider? I would really like to stick with a diffusion-type design. Anyone have any luck with just beefing up the Elwood and adding a vc coldlight? Thanks ahead of time for your thoughts.