I think the list is okay except for Jaguar winning Car Of The Year and the Astra twintop winning the convertible segment. IMO for Car Of The Year, a car should be an all-rounder and offering a complete package: the XK lacks on both of these, the former being that it is a Coupe (not as practical), and secondly, the interior of the XK is really a shame. And as far as I know the Twintop is as good as any other convertible out there, unless anyone can enlighten me on anything special about it.
The Focus ST is a really impressive car. I went to see it over the weekend, but I was utterly disappointed when the dealer said only test drives were available after putting down a deposit.

The interior is quite a let-down though, and for 'completeness' I'd get a Golf, anytime. For the power, perhaps the ST would be better.