yes! There is no difference between "Models" of Xbox 360. it is the same hardware, same software, same functionality.
Yes, the Xbox 360 Arcade can play DVDs.
PS3 games are DVDs and do not work on the Xbox 360 consoles regardless of the model type
the xbox 360 arcade can play the same games as the normal xbox 360
obviously its an xbox 360
yes it can play any xbox 360 games
Yes, you can play any 360 game on a 360 Arcade.
yes
no
Yes!
As far as I know, you can't play Halo 2 on a Xbox 360 Arcade. The Xbox 360 Arcade can NOT play regular Xbox games. To play Halo 2 on your 360, you'll either need to: A): Get a Xbox 360 Pro or Elite Hard Drive somehow, or B): Buy a new Xbox 360 Pro or Xbox 360 Elite
Yes the Xbox 360 game does work on the arcade
yes the big difference between arcade and elite is memory
Not sure about the original xbox.But the Xbox 360 can