X5 2002 Vs 2003 Vs 2004

[mariosp]

Hello,
I am interested to buy a used X5 and I would like to know what are the best steps that I have to follow to get a troublefree used X5 car.

My other question is to to choose between the 2002, 2003, 2004 models,
I know that the 2004 is the facelift( the most expensive of these) but I also want to know more details about the differences of these models.

Someone told me that the 2002 and 2003 dont have the Xdrive system,

I would like to confirm and please let me know other details and let me know please. is an urgent.

All the models that I am looking for are 30i, sport package.
Also regarding the Navigation system do u suggest me to look for navigation ?

Thanks

Marios (future X5 owner)