I blogged on getting HD going on the XBOX a few weeks ago, and included a link - http://www.theplaycom.com/xbox-hdtv-pack-p-54.html $NZ35 Shipped. Output quality is good, no softness or sync issues.
cihlin, I'm not sure how you're going to get a HDMI out of an XBOX1 it's max out is 1080i so component is all you really need.
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