anjin, i'm from zaragoza! (it's a little strange to talk to you in English since we are both Spanish, but since this is an international forum, I don't like to exclude anyone...)
If you want to test the N900 I have seen it exposed at MediaMarkt during last year, but I'm not sure they have it anymore... I also have seen it in El Corte Inglés, they still sell it without contract, but they haven't updated the price! it's still over 600€!!!
As for the "should I buy it" question... I like the device very much! I would buy it again, even now that it seems a little hardware outdated. I'm a very mad with Nokia at the moment anyway... I don't know what's going to happen with N900/Maemo/Meego and with Qt/Qt Creator which I use everyday... I hope someday we can have a N900 sucessor, even if it's from Intel. As for the N900 I hope mine doesn't get broken until then :-)