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Borla and Corsa are hands down the two most popular options and people will die on a hill fighting for which one sounds better. Borla is the original Mopar 2 muffler system, Corsa is a 4 muffler system. Both are 3" diameter.
Note* Borla has 2.5" inlet for stock cats, but can be modified to accept 3" (headers) where the standard Corsa is 3" inlet (requires reducer to fit stock cats) and the 2.5" Corsa inlet is special order.
When replacing the exhaust, it is a great time to vent the rocker panels to keep cabin temps down.