Hi Greg,
No, you don't need the remote, just tried it on the operator panel of my D50, just press ENTER, ENTER, UP, DOWN, ENTER. That will put you into Service Mode, then just push the MENU button to get the display up.
You occasionally see remotes on ebay, or you could try
www.crtcinema.com
they carry most stuff.
As far as which one to keep - I have been very happy with my D50, and although it's only a 7 incher, it is reasonably small and quiet and very bright and has an excellent picture.
I guess it's a case of trying them all out until you decide which is best
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