That is beautiful! My biggest fear with running 18s is the short sidewall looking a little off, but that looks great! If I could get that with a little more dish I'd do handstands!
Dish will be easy for most in the rear (if an A body rear). It is harder up front, as you'll need a decent amount of offset to tuck the wheels in the front fenders. There are some wheels that can still be had with dish and a decent offset, though.
To date I've run 18x9.5's square in both +45 and +38 offset. I am running a 60.5" width rear (roughly 2-3" wider than factory A body). 265/40/18 and 275/40/18 both fit in factory wheelwells (trimming required in front corners). I did give up some turning radius, and I did have to notch the inner fenders. My ride height is at the factory bump stop height or lower (1.5" at bump stop or lower). Running 5/16" bump stops.
My biggest thing for look is tire height. The taller the better! I even looked at 275/45/18 for the rear. If you aren't racing no need to stay square- get a tall back tire for sure.