i currently have a Pioneer 275-S and it is pretty good...picture quality seems ok...i have been wondering if i bought a Denon or some other high priced dvd player if my picture/audio would improve greatly or only a little???

also...my tv, the Samsung 5515W 55" rear projo does not have hdmi or anyting. just component....so would this also affect the results with a "higher end" dvd player? can i still get a better picture?

my tv does 1080i or 480p only...it does not do 720p...also, i was wondering if a DVDO line doubler would have any great effect??? TIA...sorry for all the questions
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Axiom M60Ti Infinity 2000.6 x 4 Infinity RS1 rear Infinity CC200 HSU VTF3 - MKII