Check into my V6 exhaust sticky thread and look for the flowmasters section.
There is video of someone running the Flowmaster Delta 40 series, he has good info in the thread and plenty of video. I think the car sounds sweet on cold start and normal idle and under low to medium throttle, but starts to get a bit raspy when it is punched, but overall it is nice and I'm sure sounds better in person.
If you can, try to listen to the videos using decent headphones or speakers that can recreate the lows of the sound in the video.
Personally, I'd probably go for these over the others simply because I know they don't sound too bad in these videos...no idea what the other would sound like???
Good luck!
Better yet, here you go:
http://www.camaro5.com/forums/showthread.php?t=54280