IMO, they suck. Had a Pontiac G6, 2007...blew both sides rims on a pot hole going 25mph, the fourth day I had the car. Ball joints and wheel bearings went out next, as well as the I-shaft. Had a supercharger installed on the car...and the dang thing lost traction. Maybe I got a bad car...came off the production line on a Friday.
I've seen a few souped up G8s...they look nice...you just gotta be careful with them.
Ended up in a car accident with my g6...won the case, got full insurance value out of it and bought an Impala LT 3.9L series, installed a supercharger, lol. That thing kicks off a crap load of HP. Love the Impala.
I see you're listing a lot of sporty cars...if you are on a budget per say. Get a Monte Carlo 2002 SS Pace car. Has a turbocharger, thing will get up and roll.