Touratech in SEA had a nice carbon fiber pipe that sounds nice and eliminates the CAT. I heard it and liked it. I can't find it in their catalog though.
I put Remus on my Vstrom and ZTechnik on my 03 GSA. Now I have an 08 GSA and I like the stock pipe sound. When I put the ZTechnik on the 03 I noticed it said "off road only" which makes the thing illegal for street use if that ever becomes an issue.
For now I am keeping mine stock. I like the sound. I made a 3 day trip with some Harley friends with straight pipes. Cruising was no problem because they were behind but slow in town stop sign to stop sign they were obnoxious. I like quiet.
Also once you spend the bucks and put a new pipe on your bike you will only see guys with stock pipes. While you have your stock pipe you probably are seeing a lot of after market pipes.