Ok.. pretty much you're set on dual cause you think it looks cooler.
Since you seem to be set on no burnt tips, just want the polished steel tips that narrows it down even more.
How loud do you want it to be? You can go "full retard" with the ETS "Extreme" or.. buy the regular ETS system and it will still be loud. Or the "quiet" version - and again it will still be loud, but not as loud as the "regular' system.
Plenty of other choices.. AMS, Perrin, Borla..
I would never buy anything i mentioned above though, since i dont like the way they sound.