I've just purchased a '04 525 EXC in Australia. They still aren't legal in the USA as is. European models are identical to USA models, except that they include turn signals and on/off road tires. Depending on where you live, (elevation) you may have to re-jet to get the optimal performance. In fact, most of the KTM's used Dakar 2004 were European models.
Truck9, looks like you're also a member of 4strokes.com. I posted a more lengthy response to your post there. Also posted a couple of links with pics. Best of luck with whatever you decide to do. dark :-)