Then by iconic we are also referring to the most 'instantly recognisable' cars. So a Porsche 911 would have to be included, Perhaps a Ferrari 250 or F40, Lamborghini would have to be there (probably with the Countach, which is still more iconic than the Diablo, Murci or Gallardo).

From Ford either the GT40 or Mustang.

Mini would qualify (old one), plus Audi Quattro, perhaps a BMW 3-series (as being the iconic saloon/touring car).

Then you'd need to add some convertibles, although not sure which one.

And finally, what about the Range Rover or Land Rover Defender as being iconic within their genre?