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Borla is a good choice. I know of a set of flowmasters that you can pick up cheap (like $100? $50?) if you want. Buddy just swapped in Borla's for his.
What part of mass are you from? We have our own regional section so come check it out!
A word of advice (having had the Flowmaster American Thunders on my '06 GT): There is a reason they are cheap, IMHO. Go with the Borla, Corsa, etc., even though they are pricier. They just sound better. Again, just my opinion... not trying to kill the sale of S197GT07's friends mufflers.
I have Borla exhaust on my Charger and Magnaflow on my SRT8 300. I love the tone of the Borla, but I also love the aggressive sound of the Magnaflow. I plan on putting Magnaflow on the Mustang in the very near future.