Do you need better brakes or just want them? For the street, I would upgrade to slotted rotors and get some good pads and be done with it. If you really need brakes or just want the overkill, try this site,
http://www.baer.com/The offer a 6 piston caliper, 14" two piece rotor for the front and back.Make sure your current wheel will work with whatever you go with.