i have one too, a friend of mine on a business trip in the US got it for me, I live in Romania and the N800 is not available here, you can only find here the 770 for twice the price of the N800 in the US

to answer your question, you can get the n800 from the US with no problems, everything will work out of the box except for the charger for witch you have to get an adapter (i paid 1 euro for mine). Also every new nokia mobile phone charger works