I just traded in my 2006 Charger RT (silver) for a 2007 Impala SS (black). The SS is faster 0-60 @ 5.6 sec. vs. 5.8 sec. for the Charger. The pros for the SS is that it has more bells and whistles, suspension is a whole lot tighter, its faster, and its Black. The pros for the Charger are is a lil bigger, rear wheel drive, foreal duals, and looks looks better. Overall, I like the SS more b/c it drives fast comfortable where the charger at 120mhp+ makes me nervous.
For all of those who think I'm squeemish about speed: I took my 2008 Ninja zx10r to 191mph. Mods: Powercommander 5, Level one racing slip on (gets rid of Cat) and K&N air filter.
Lastly, the SS is a better built Car. Drive them both and you'll see. The SRT 8 Charger is a fair comparison to the SS on everything ,but the Motor.