the RH win series is a good press, I would advise you go with the 6 color though, 4 colors is not enough, if the design needs a flash, that kicks your color max to 3.
when I was first researching equipment, I was considering the 4 color as well, and then someone gave me this same advice and I took it...good thing too, as one of my first jobs was a 5 color with a flash
