Does Magnaflow make a kit for the new V6? If so, you might want to go with them. Chokemaster might sound good, but they are restrictive and made out of aluminium which will rust away.
Magnaflow is a straight-through design made out of pollished stainless steel. They will give you better performance and durabiltiy for about the same price.
I've had them on my 2001 GT for years. I've got many comments from mechanics and the general public that has heard the car. It sound like an exotic.