Should I buy a BMW M3 convertible or a Jaguar XK8 Coupe?

I am running a 105,000 mile 2001 Saab 9-3 convertible, worth about £2500, I guess. I fancy an XK8 Coupe. But can I get one with a sunroof? Or do I get another 4-seater convertible, which would be more sociable with my friends; maybe something a bit hotter such as a BMW M3, for example? I could spend £16,000 to £20,000. I do about 7000 miles a year.

Asked on 9 November 2013 by DJ, via email

Answered by Honest John
M3 straight sixes are high maintenance. It’s a 12-plug engine and a new set of plugs costs £500, for example. However, you are in the money for a current shape 2005/2006 XK 4.2 convertible and you can get four into them if you saw the back passengers' legs off. That's a much better bet than the cheaper coupe.
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