I'm in the same boat as you. I'm not sure on whether 18s or 19s. 18s has more tire options and they are cheaper than the 19s. Not sure whether 19s are worth it. Have you thought about 18s up front and 19s on the back?
2013 Silver V6 Premium, Ford Racing Handling Package, MGP Black Caliper Covers, Airaid CAI, Bama Tuner, BBK Catted X-Pipes, Corsa Sport Axle-Back Exhaust, Alum One Piece Driveshaft, BBK Ceramic Shorties, Whiteline Adj. UCA, Whiteling ADJ. Lower Control Arms, Whiteline Adj. Pan Hard Bar, Upgraded Rotors (Cross Cut and Drilled), Ceramic Pads, J&M Stainless Steel Brake Lines (Front and Back), 18" Staggered Chrome Bullitts, MMD Eleanor Side Scoops, Side Scoops, Roush Front and Lower Grilles and Super Snake Stripes.