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Difference between 722 and 722k?

Whoops. Yes. However S-video makes artifacts on SD channels stand out more. For HD though, it would be a (slight) upgrade.
 
Yep, slight upgrade...that's why I was only half serious.
 
(sorry for the hijack, folks)

I have an old one, a Philips DVDR72, it only allows 480i obviously, but no hard drive, so I don't use it anymore as the hard drive convenience supercedes the component option.