of the current cars?
Pontiac: G8 sedan, a Solstice
Chevrolet: chevrolet version of the G8 (if built) any 97 to current corvette.
Buick: none unless when i retire, but the only one i want is a late 80s Grand National
Oldsmobile: RIP
Cadillac: CTS coupe with the 306hp D.I. Cien (if they ever build it

)
Saturn: Sky, i think it looks cooler than the solstice
Hummer: that little Hummer concept that would make a great competiter to the Jeep Wrangler
thats about it