Regarding the user who suggested the Cobalt, the WRX or SRT-4 ACR are much more powerful, better overall choices, IMO.
My votes:
1 - Chevrolet Corvette Z06
2 - Mercedes CLS
3 - Mazda RX-8
The Vette is a great value, cannot be beaten by any street legal car (excl. cars like the Radical which i'd hardly consider a real car due to its impracticality) under, like 150K USD.
The CLS has a beautiful design and as Brabus showed, it can have power. They reached like 800 or 900 lbs of torque at 2400 RPMs. And about 750 hp.
I love the design of the RSX, the Rotary is a very intriguing design, the freestyle 4 doors are cool, and its handling and braking are amazing.