@poster stop being a dealer and sell the car. for each person you are offereing him a price. but the fact is that you are here to sell, so i would say SELL first and then counter offer anyone.
plus for this, 390 is way above, even if it is a diamond car. but for 2006 i dont think it would be available in 400k , i think it would be around 450 (best genuine). on the other hand, i can buy much better model with 390.