Magnaflow makes a few mufflers that sound pretty good, others are kind of blatty.

You can hear their products on a few vehicles here.

http://www.magnaflow.com/04sound/trucks.htm

http://www.magnaflow.com/04sound/domestic.htm

If you put your exhaust together and it sounds too raspy you can always put in a large diameter glasspack between the catalytic converter and the muffler. That is 100% garunteed to make your exhaust sound DEEP.

Abe