Whoops, battery in the laptop ran outta juice. Continued....
For what you want, I would suggest a used 625 SXC, or a used 640 ADV. Both can be had for very reasonable price, especially an ADV. I think I speak for most of the guys here, when I say the 2003 was the high point of the model. If your going to be using it offroad, why pick up a new one, when there are plenty of well cared for, low mileage and often well equiped examples to choose from? The transformation from SMC to ADV would be very spendy, I would estimate about $2k usd, (not counting wheels, brakes, etc.) It is quite a bit cheaper to swap a ADV over to SXC/LC4E spec. A 625SXC with 17's would work pretty well on the street as well.
Österreichische Motorräder und deutsche Autos. Wie wundervoll kann das Leben sein