What kind of mufflers for 04 impala SS?

I have a 04 Impala SS the V6 3.8L. I wanna put mufflers on but I dont know which ones too put on. I want the most aggressive tone and the most performance. Any idea's on which brand such as...
-flowmasters
-ss 409
-magnaflow
-bullydog

I put on a corsa cat back, best investment you can make, pays for itself in gas alone. I was lucky enough to purchase online for 850. Seems like under a 1000 is not an option anymore.