Man, you've got a really nice car there....I'd seriously consider waiting a year or two. If you owned a 2005-2010 GT, the decision might be different, but as it stands your 2013 is really a nice car.
Be patient my Jedi Padawan learner!!
2014 Mustang GT Coupe Premium. Options include: California Special package, comfort package, navigation, glass roof, shaker pro system, 3.73 ratio limited slip axle, GT front grill/fogs, MGW race spec shifter, BBK X-Pipe, Corsa GT500 Quad Sport axle-back, Ford Racing ProCal tune. "If I wanted insane HP, I would have purchased a 2014 Shelby GT500!"