Okay so I am sick of our cable companies DVR. I am thinking of getting a tv tuner for my iMac and using it as the DVR then streaming the tv shows to my AppleTV. I am lookng for a couple things one it must support clear QAM for HD shows, and I am also hoping I can find one that has multiple tuners so I can record more than one show at the same time. I know about the Elgato tuners but don't know if they support multiple recordings. Also is the 250 from elgato just the hybrid with built in encoder or does it do more than just that? Anyone have any other suggestions for tuners? Remember I have an iMac so no internal cards.