I looked at quite a few privately and at dealers and the price and condition varied hugely. Just because they are expensive cars doesn't mean people look after them! I think your add is fine and honest. Even if I didn't know it was you, the ad would have made my list of potential viewings. See what response you get, you can always come down a bit if you have to. It's just a less cheesy way of saying "go and look at the rest and then come and see the best" an old autotrader line.