So lets say my tv will do 720p and 1080i which is the hdtv ready rear projection and that I use progressive on my denon 1600 player which is 420p. So if I want better picture quality keeping my dvd player then I should buy an upconverter? Does it actually convert it to 720p?

Axiom M60s, VP150, QS8s, EP500 -- Rotel 1075 & 1068 -- Panasonic BDT500 -- Panasonic 60S60