How does it sound like? Is it nice and loud and has a deep growl? That's type of exhaust I would prefer to have.

Fast Intentions has the sound you are looking for. I believe the borla has the same sound too but have not heard it in person. But the Fast intentions is kick A$$

I for one like the Zele Exhaust (ZELE Titanium Muffler Type2). Not sure about cost but I like the way it looks

http://www.zeleperformance.com/media...70z-06-low.jpg
http://www.zeleperformance.com/media...70z-07-low.jpg

What do you mean by droning sound? I have to agree with you, I like a good deep exhaust sound, but I wouldn't like to hear it all the time.
What i really like the sounds of the Ferrari's and lambo's. They sound good, and when you punch it hard, it even sounds better.

Droning is when the exhaust vibrates into the cab. At a steady speed (above 65MPH) you'll hear that save vibrating noise loud enough in the cab that you really can't ignore it. It will drone when the sound frequency changes a little back and forth.