You'll like the Magna Packs! I have them on my Mach1 and the wife has 'em on her GT also. While they are louder than the Magna-Flows, they are still quiet enough for daily driving.
I thought that exact setup sounded pretty good on my '02 GT, so did most other car enthusiasts I ran in to. I've had people chase me down just to ask what exhaust setup I had.