Buy Audi S8 ???

Tach Post, I'm usually represented in the V8 forum. However, I was offered an Audi S8 (my V8 will definitely stay with me!!!!). It is a black S8 year 1998 with about 125000km and almost top condition with new timing belt etc... (on a bench even New valves :-) which had a work colleague on it:-)) So the thing has faith pretty much everything except heating, fartsrocken, inside top, all original .....converted to gas.......Checkbook maintained (I can understand since he was always with us). Question 1: What else should you pay attention to? Question 2: What else does that cost at the moment? And last question; what would such a bomber in the insurance about. cost (I am so at 50 percent).- Hearing is said to be very expensive.