You can save a lot on the 14s now, but I've seen the 15s up close and they are sick. If my wife was still working I would be thinking of trading my 2011. Launch control, and wheel lock... The 2015 is just sick.
2011 Mustang GT Premium, Brembo Package, 3.73, Manual, Black, C&L Racer Intake w/ Bama Perf tune