I assume these are cars that they currently produce, and are readily available.
Honda/Acura: Odyssey/TSX Sport Wagon. Great utility cars.
VW: the new Euro Phaeton. Understated luxury.
Nissan: 2012 GT-R. Enough said.
Mercedes Benz: SLS AMG. Also enough said.
Porsche: Panamera Turbo S. Ugly, yes. Very fast, also yes. And surprisingly comfortable.
BMW: 335d. Sleeper commuter car.
Chevrolet/Pontiac/Caddy/: Corvette ZR-1, Cadillac CTS-V Wagon. No Pontiac for me.
Dodge: 300C Hemi. I actually really like the 300, when it's not blinged out.
Ford: the new Shelby GT500. Hello 800hp.
Lotus: Evora. I want something I can fit in.
Mazda: Miata. The true soul of zoom-zoom.
Mitsubishi: Erm, can I skip? The Evo, if I had to pick.
Toyota: LF-A. If I can.
Audi: A7. It's just so sexy for a big car.
Saab: 9-3X. It's plain bonkers.