Hey Spidey - If you like the dual exhaust look (as I do) you might want to consider Micron slip-ons. I have a pair of the Carbon Fiber cans on my new S3 and I think they sound great. (Of course).
IMHO they are really well-finished, quality pieces and follow the same basic size of the OEM cans. In fact the dealer had them on the bike while it was in the showroom - before I bought it - if that's any type of endorsement. They seem put-together really nicely, run about $800 and the sound that comes out of them is a nice low rumbling exhaust note. They are not too loud and really don't have much of a high tone or pitch to them. Just a cool burbling sound.
I'll post you a picture when the photo post option is not "full".
Hope this helps,
-CT