Dvd Player Price Great Unit !!!!!!!!! Is There A Difference Between A DVD Upconverter Vs. DVD Player Vs. Xbox 360 For Watching Movies On An HDTV?

Is there a difference between a DVD Upconverter vs. DVD Player vs. Xbox 360 for watching movies on an HDTV? - dvd player price great unit !!!!!!!!!

I have an HDTV. I put a DVD and does not seem so great. I have 800 DVD's. I was not happy. Viewed DVD upconverter announced in the newspaper about $ 100. Is it worth the cost?

Will my Xbox 360 and DVD upconversion?

Up-Converter is a simple DVD player to progressive scan?

I Should my DVD's (any player who until the end of the election) in 720p or 1080i?

Many questions !!!!!
Thanks