What's the difference between the Japan PS2 and the Asia PS2? On play-asia.com the Asia one is $30 cheaper than the Japan one. But other than that and the model number (9000CW vs 9006CW) they seem identical. Both descriptions say they play NTSC-J games, and that's the only reason I would get a PS2, for Japanese IIDX/GF/DM games.
Also, be sure it's a 100W system, not a backwards 220W or so that some asian countries use. Those systems will either not work or fry your outlets
Strangely, one version though uses an autovolt power adapter (meaning that it runs on 100V-240V on 50 hz and 60 hz cycles). I think that was SCPH-75006CB.........
However, newer 90000 models for Asia (like the 90006) are only 220-240V. Better make sure that you check it out first before buying.
Still, if you can find a 75006 model, then that unit uses autovolt (meaning that it can work on any electrical socket/outlet anywhere in the world).