19's definitely look a lot better on the newer body styles if you ask me. The only thing I would watch out for, would be the difference in tire height and revs per mile. Too big of a difference between the front and back and you could inadvertently trip your traction control, whenever traction control is on of course.
2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts