I'm new to this site and will be watching the answers you receive, as I too am in the market for an exhaust system.
I'm with you, and though I've searched the forum on the topic, still have not gotten much first hand feedback, particularly on the B&B cat-back system. On some of their early Vette systems and on a number of other V-8 systems, they were known for the dreaded "drone". I'm told that their new systems to not have that issue. The quality of the systems look great.
Like you, I'm not going the header route. I did that stuff all through the days when I was racing and such, but really don't want the associated down-sides with this vehicle. That is just my very humble opinion, so all the "header lovers" don't start flaming me with abandon.
In the end, a nice aggressive, yet not offensive (I know, somewhat subjective-put your "reasonable" hat on...) exhaust note would be great.