thats 6" though, dont most people run 3 or 4? just found this site the other day and am getting all sorts of ideas now. hope to start my own setup in a few months from now.
*edit* not that 4" stuff is much cheaper. item #3537 and its not an elbow. but for 2-4 bucks a pop for glue together fittings I think that will be my route...