JASMA or local, the sound will depend on the design.

Mufflerland has local mufflers that have a nice tone but aren't so pricey.

Wherever you buy, make sure that the interior wall is a fine grade mesh without drill tailings or lots of welds hanging in the airflow. The bigger and longer the can (the body of the muffler), the deeper the tone.

If you've got a 1.6 liter engine, don't go bigger than 2". If you've got a 2.0 or bigger, don't go bigger than 2.5". Only get a 3" muffler if you've got a turbocharged car. ;)