First of all: I understand this forum to be a place where you can get the latest news and help about your PS2 concerns. BUT this forum has a strict policy when it comes to illegal things, so this one is a bit tricky and I´ve spoken to one of the Mods regarding this special case.
Now for your question:
To buy a new PS2 for playing import games on it, is just a huge waste of money. You have to buy a new console (and maybe a power converter) and some other new stuff.
There are other ways to "modify" your console so it will play ALL import games from Asia or Japan. Let me add one last thing here: To do this is in no way illigal, but you can do illegal things with it ! So it´s up to you to stay on the right side or not...
Please don´t ask any more questions here regarding this "modification".
If you still want to buy a new console, I would buy the asian one. On the page it says: Asian version, unmodified running Japanese & Asian version games only !
Have fun !