Is yours a full-HD setup, where the DirecTV receiver is HD-capable and both tv's are HDTVs? If so, I'm currently considering the same thing. Supposedly, the DirecTV HD receivers output from all connections simultaneously. I use an HDMI cable to my main tv and I thought I would run a component (R-G-B) cable for video and left/right RCA audio cable from the DirecTV receiver to the second tv (about 30 feet distance for me). My second tv wouldn't need 5.1 surround audio like the main tv (connected to an audio system in the main room), so this should work fine when I add the second tv shortly. I also heard that HDMI is less reliable over longer distances (more than 20 feet maybe), so component might be the better choice for the longer run.