Exaust upgrade Questions

I am thinking about getting a cat back system for my 04 Grand Prix GTP. I am debating between the borla, corsa, and SLP. I would like to know what they sound like at idle, accelerating, and crusing speed from inside the car. Looking for a kit that has a good rumble at idle, but not too ricy during acceleration and crusing.

I have a 04 CompG GTP that I put a SLP catback exhaust system on and it looks and sounds great! I have only compared my exhaust to someone that just replaced his mufflers for a high performance Magnaflow muffler and the SLP system that I have blew his out of the water. The SLP doesn't sound ricy at any point of our RPM range and I get asked a lot if I have a V8. I installed the K&N air charger system the same day so I can't really say how much of a HP gain that I got from the exhaust, but I definetly had a awesome sounding car and a little difference in the peddle. The only negative thing that I can say about the SLP catback system is that the exhaust tips that come with it don't really look nice with our cars.

cool thanks