How much is my Mercedes SL55 AMG worth?

I need to sell my car 2005 Mercedes-Benz SL55 AMG, but can't get much price guidance from Parkers or Glasses guides because it is a model fitted with the performance package option which is reasonably rare.

It is fitted with most other available options except parktronic and cost about £20k more than the standard car when new. Can you give me some guidance on the price or suggest where I can get guidance?

Asked on 1 July 2016 by rbailey28

Dear Honest John,

Please help me choose my next car. I would like it to have:
    Select a few terms below
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Looks good and make you look rich. 2006 models with increased power vastly better cars. 388hp 500SL plenty fast enough and makes a nice noise.