Difficult to get exactly, but I bought my CLK320 cabrio in Sept, so I think what i saw should be fairly current.
I paid £12,500 from MB with Tier 1 warranty for mine with 54k miles on a 2000 with FMBSH, all bills etc, , fully loaded except command and telephone prewire, but almost all other extras.
This is a 430 which seem to be less desirable than the 320, most of the 430's I saw were £1k or so cheaper, as they seem to be more difficult to shift.
So against the price I paid, I would say knock 1K off for no MB warranty and another 1k for the fact that it is a 430. So that makes £10,500. I would say knock another £1,500 off for the mileage but offset with being 1 year younger.
Add back £1k for Comand, the Wooden wheel etc and the brabus bodykit.
So that takes us to about £10k, as premium price for a Car that is in A1 condition with 12 months MOT and all servicing done.
Here is what Glass's says from the Vauxhall valuation site
http://www.virtual-showroom.co.uk/sc... b&sessionid=0
Part-exchange Price:
Excellent condition:
£9440
Average condition:
£8560
Below average condition:
£7540
Hope this helps, personally I like it, but there will be a lot of buyers put off by the leather colour.