This is NOT an HD box and therefore this thread is misplaced. Also, this box has NOTHING on the DirecTV/Tivo combos from Sony and Philips other than that the 2nd tuner works. The Tivo combo has a second tuner, too. Of course, the Tivo unit *is* actually shipping, unlike this mythic box. And, I wouldn't be shocked if Tivo has the software out to enable the 2nd tuner before this thing ships.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.