Ah grasshopper.......my advice is to get to a VCA club event, Viper Days event, or just a bunch of Vipers at a ******* and listen to all of the different sounds and decide for yourself.
Here are a few of the items on the "sound" menu:
Corsa
Borla
B&B
Belanger
Snake Oyl
TNT
Random Technology
some of the above are cat-back systems and some are rear sub sections only. Then you can add hi-flow cats or go catless which changes the sound. So as you can see there's plenty of ways to do your 'zaust! Exhaust sound is SOOOOOO subjective, and folks are really passionate about whatever system they have on THEIR car!
Good Luck!