Let me suggest changing to size 235/55R19. This size is only .4" taller and .4" wider than the original tire. That equates to about the width of a pinky finger. This size will fit on the factory 19 inch wheels.
Here are a couple great options to take a look at.
Yokohama PARADA Spec-X
And as always, if you have more questions, feel free to contact your favorite sales specialist at Tire Rack for more information.