As a Hemi Charger owner ('06), but I'd have to say Camaro SS. More HP and Torque, better suspension, lighter, better millage, faster, Limited slip, $9000 cheaper. AW/Autoweek did a review of the SS this week.
I'd take the Camaro over the Mustang GT500 also. However, I've always been a Function over Form guy; I own what's considered one of the ugliest motorcycles ever, the Buell S1W White Lightning.
I've been looking at these british car shows on HDNET that talk about classic sport cars. My Charger outperforms every one of them. Hard to believe a full sized sedan outperforms Ferraris, AMG M-Bs and BMW M cars. We're in a golden age of cars right now. Todays cars has tons of HP, great handling, crash protection, and even millage. Even the Honda Accord comes available with a 270hp engine.