I am using a hand me down Flowmaster 44 with an 18" resonator before the muffler.   

The guy who gave it too me hated it because it was too loud for him but he ran it alone with no resonator. The resonator really takes the edge off though.  It has a mild drone at freeway speed if you are in it and a big one at about 2,100 rpm around town but it does sound deep and throaty.  Not too bad at all the other RPMs.

I ran one of the cheap stocker replacements and it went all loose inside after about a year.  If you go the stockish route get the walker or something on the more expensive end.  The construction quality is not there on the $22 ones.

I will say the hybrid seems to like free flowing exhaust.

I have also heard good things about the "coffin" mufflers.