Hypothetical What Car for European Jaunt

[WildCards]

I really like the idea of a summer road trip with my family, but there's slim chance I could afford the time off work so this is all pie in the sky stuff.

What car would you choose to cover an 8000 mile road trip across western Europe with the Mrs and two kids. Digs to include B&B's, hotels and some camping so gear needs to be carried with.

Um, to keep it amusing let's choose two cars;

1) A real world car. With a budget of £20,000 (purchase cost) and reliablity and MPG the big decisions makers.
2) A balls out, you've just won the Euro-millions, cost no option choice.

Please include working out...