Try asking this at http://www.avsforum.com/ , you should get a better response.
If this is a HD unit, sure, why not get a progressive DVD player w/ Faroudja chip in it to fulfill the potential of your HDTV. Panasonic used to make 5 disc progressive DVD changer w/ Faroudja chip in it (discontinued $220-CPK 72 or $130-CPK65, after rebate). You can look for those, or get a $450 Yamaha 5-disc DVD changer w/ Faroudja chip and DCi technology for concert DVDs. B/c I have children, I'm an advocate for 5-disc changer. :> )
Four slots always have kids' movie, and the fifth one is always available for my new release. :> )
Good luck to you.