Hi, as far as I can remember, Sony moddified the newer versions of the PS2, so as not to work with Datel's DVD region X. However, I believe if you get the Datel Action Replay for the PS2, this also has the region X included and somehow it works with the newer PS2.
If you do pick up the AR, make sure you can return it if it does'nt work! They may have updated the PS2 further!
regards