the only disadvantage of having 18s all around is you will have one inch taller sidewall in the rear compared to the front if you maintain the proper tire diameter... it just so happens 255/40/18 is exact same diameter as 255/35/19 we wear stock... and best part is you can get continental extreme contacts in that 18 size for 161 a piece from tirerack... those tires are all season and have a reputation for excellent grip in the snow...

so, for a street setup... 18s are a excellent way to go. the brakes in the rear are tiny so do not worry about fitting a smaller wheel over them. and having a bit more sidewall, even if just at the rear, will give you some extra insurance against potholes...

i am considering running a slightly taller tire in the front and using H&R springs which lower the front a bit more than the back to even out the stance... for me, its about a streetable nice setup as this is a daily driver...

the way chrysler designed it, it looks great with the stock wheels... but it looks great as a weekend car, not a realistic daily driver that can eat potholes.