My dad's car: Mercedes Benz S430. That thing's peddle is so soft, that it's really scary to touch it. And the steering....OMG...soft. Launch = AMAZING. He owns the un-facelifted W220. I think it has something like 250HP, but it feels like sex. And I've driven a Porsche Boxter as well, but preferred my dad's car.
edit: this is the Euro spec car, my dad live's in Europe.