I had Flowmasters on my old 2000 V6, and I thought they sounded pretty damn good... Got compliments from many people on the sound as well.
However, on my new V6 (2007) I will be trying out a different exhaust set-up, Longtube headers, high-flow catted X-pipe, and a straight through style cat-back... all made by Stainless Works.
I also have a little more money to work with on the new V6, seeing as how I was only 18 years old when I had my 2000.
-jeff