I'm thinking about ordering the 420 HD receiver but was wondering if a HD tuner card for my HTPC would be a better way to go. Do the HD cards require a hi end setup to work well? My HTPC setup is; Asus A7N266-VM with an AMD Athlon 1600 with 512 of memory. Which card's seem to work best? I assume you can record HD with the cards. I'm using my HTPC with a NEC 42MP3 Plasma. If the HD cards record digital programming with good playback I think that would be the best. What do you guys think?