Seen one of these for sale. Do they operate by themselves or do they need another module for input. I know Runco are good but some of their projectors are 2 box systems. Is this? Having trouble deciding on a projector. Originally wanted the Screenplay 5700 then out came the Panny AE 700 which on paper seems better. Then throw in some cheap CRT's on ebay and my mind is in a turmoil. Which way should I go. Thanks for any advice.