I also vote for the DVD player.

However, I recommend that you don't bring the original
DVDs. Make back-up copies of the DVDs and pop them in
the DVD player(or in the carrying case).

Benefits:

(1) No more worrying about the kids scratching the DVDs
or using them as frisbees...

(2) If you lose a back-up DVD, you're only out 20 cents,
not 20 dollars.... Buy blank DVDs in bulk...

(3) the kids won't be forced to watch warning messages
and commercials... they can start watching as soon as
they press "Play"

Just my two cents...