I run a Magnaflow #12278, single in/dual out muffler. Not too bad in the cabin when cruising. It is a bit loud in the cab so the wife may not like it. Mine likes it.
The longer the muffler is, the quieter it will be. Mine is 18" long in the main case, 22" overall.
So if you want it really quiet, go with a longer case (22"?). If you want a little bit of growl, go with an 18" case.
Sorry, can't pick it for ya...exhaust tone is a very subjective choice. My wife did NOT like the Flowmaster I put on her Yukon and I switched it out for a Magnaflow and she liked that a lot better.
Good luck with your choice!