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Find a muffler shop in your town that will do the A & A mod for you. Makes a little more noise at idle, some more than a little more noise when your pushing it, cruises very quietly.
Exhaust is such a subjective thing. What sounds good to me might easily be too loud or too quiet for you.
I suggest that you visit a spot where there are other C5's present and ask to listen to their systems. Listening to a car at idle will tell you nothing. How does it sound at WOT? How about around town at various RPM's in different gears? How does it sound at cruising speed? This last issue is very important - some of the systems generate an annoying rumble known as "drone" that can get really irritating after an hour or so. Maybe you'll be one of these folks that doesn't mind that - I do.
Another point to consider, do you routinely have a passenger with you? If so - get that person's opinion too. Nothing worse than the drone coming from your passenger's mouth complaining about the exhaust noise...talk about taking a pleasant cruise and turning it into the CRUISE FROM HELL!
There are many tip configurations too - oval, round, two tip, four tip, ellyptical, etc. Find what you like - good luck!