Exiztenz, if you going to get the game from someone, might as well take the whole file patched and ready xD. I have the US version. The first time i bought the WoW DVDs from Nino, they were Eu client, if you know where he is, might be your best bet :).
vengeance666 wrotei got the US version of the game with the "WTF stuff" of EU , including patch list and i never got any problems so far , in fact if you leave the patchlist as US and you play on EU servers , patch will be downloaded about a week before EU ( since US gets their patches 1 week before EU ) and you won't be able to join EU servers for a whole week until EU servers are updated to the newest patch..
Are you sure about that Vengeance? I used to have the EU client, and I had the WTF info changed to US except the patchlist. When a patch used to be released, even if I changed the WTF patchlist to US, it wont update until Wednesday, or through forcing it by changing the enEU file name to enUS, which at the end damaged the whole thing. But I guess your case was easier to go through since US patches comes out before EU.