OK, I'm considering getting a new tuner (currently have Ati 550 Pro and AIW X1900). I want to do the following with it: connect a new digital cable box with coax out to the tuner. Here's the thing: the digital cable box is an HD box and outputs HD via coax. What, if any, tuner cards will allow me to watch HD this way? I have an idea of what I need, but I'm not 100% certain. If anybody is familiar with this type of setup, please enlighten me as to how it works. I should mention that I like using Windows Media Center. I use it in both XP MCE 2005 and Vista Ultimate (32 bit).