Brrrrrrrrrrrrrmmmmmmmmm!Brrrrrrrrrrrrrrrrrrmmmmmmmmmmmmm!!! (Just kidding)
Actually here
http://dodgevipersforsale.com/viperexhaust.htm are some sound clips of Borla vs Corsa, but on Gen I and II's.
Here's a good vid of an ACR that lets you hear a nice deep lope with Borla exhaust, high flo cats, and Belanger headers:
http://www.zheaven.com/Events/SERCA/alanviper.mpg , it picked up the lope good and picked up the sound decently but still sounds better in real life. But this was on an ACR.
IMO I'd go Borla (I'll be doing the Mopar exhaust for the tips, same as Borla, no cats, headers, with an x-pipe), I just love the deep, muscle car gurgle of it. I'm not a fan of Corsa's, too tinny and high pitch sounding for me.
It's all personal preferance though, I like it loud, mean, and muscle car deep which equals a Borla/Mopar setup for me. SRT's already have a cross over so your set there, I say Borla all the way.