I think brembo makes a kid for the 05+ mustangs that will work with oem wheels. If not that you might can fit a set of the 05+ gt500 brakes on there.
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Steeda offers two brake kits on their site that have 14" discs. One is the Steeda kit, the other is Baer for less money. I would call them to make sure they fit, but the GT500 has 18" wheels and 14" discs standard. Jegs has replacement rotors that fit the stock calipers, they are slotted which should help, but I don't know how much better than stock they would actually be.
second the Steedas , I am having a set installed for the front and rear.The Steeda is said (by steeda)to work better with the abs on the 05 and up stang , costs more but they deal with the mustang more than baer , taking nothing away from baer