First off, welcome to the forums. As for your question, it all depends on what kind of sound you're going for (loud, raspy, deep, etc.) and what kind of budget you have. What I can say is use the search feature for the forums. There are literally hundreds of exhaust threads on here for the 3.7L V6, most of which have links to sound/video clips that give you a great idea of how each exhaust setup sounds. Another good tool is YouTube.
2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts