Sound is all personal preference.
That being said, I have never heard a 3800 car sound good. From no exhaust to some exhaust to full custom on youtube with the woofer turned up, it just doesn't sound good to me.
I would recommend a big/long (no that's what she said jokes) resonator, and the factory mufflers. Go ninja stealth mode, fully quiet. Focus on engine mods and make that supercharger scream and let it do all the talking. I have headers and factory catback... some rasp but mostly quiet, the blower screams and people give alook.