Realistic price for 19″ Helios with new tires?

Hy, tomorrow it’s time. My V8 is back from Dresden and is finally ready for my pick-up in Ettlingen. First official position will be to throw down the 19″er and enjoy the maximum driving comfort with 17″ impression as long as possible. Let’s see how long I can endure the look. Since I will change to 20″er when I can’t see it anymore (have never driven anything smaller on my S-Class so far), I want to sell the Helios. The GMD has “spended” new tyres and the rims should be in good condition, if not equally renewed. Which price would be appropriate for the complete wheel set? Would not want to charge moon prices, but not give them here either.