Since I read posts from people in Europe who are looking for the right power adapter, I will share my experience with the one I have just bought, and which works very fine (just tried for 1 hour so far, but still...)
It's a variable power adapter, made by a company called "Lyvia".
I don't know if it's available outside Italy (I doubt it).
I paid it 7.10 Euro, in a very generic electric goods shop.
Here's the specs from the box:
INPUT: 230V - 50Hz AC
POWER: 23.5W
OUTPUT: from 1V to 12V DC
CURRENT: 1000mA 12VA (max)
You can also switch the polarity and comes with 6 different connectors.
Here are some pictures:
http://img122.exs.cx/img122/7905/charge_rez.jpg :The adapter charging
http://img122.exs.cx/img122/6830/box_side_rez.jpg :Side of the box (voltage output graph)
http://img122.exs.cx/img122/4476/box_price_rez.jpg :The box
http://img122.exs.cx/img122/4452/box_front_rez.jpg :The box again
From what I understand looking at the graph in the second picture, since the unit seems to work at 800mA, to give it the right voltage you should set the voltage switch to 7.5V .
At least I did this, and it seems to work and charge fine so far.