Any comments on this unit? Moving into a new home at the end of the month and I have measured that a 57" RPTV will work perfectly in the family room. Upon research, it appears that Hitachi might be the best way to go (especially for the money). Or am I wrong? Also, is it true that you don't require a built-in HDTV tuner if your HD-Digital capable supplier offers an HD cable box? In other words, would it defeat the purpose to shell out the extra money for the built-in tuner if the cable company is basically setting up the same thing anyway? Or are these HD cable boxes not up to snuff? Any help or insight would be greatly appreciated. Thanks!