Wheels i ordered are 19x9.5 up front and 19x11 in the rear. Just make sure you keep the tires within 1% of the rolling diameter. There are many threads about staggered on the X and it looks damn good as well.

 

I am running Square setup on mine.
and the setup i have now, looks more aggressive than when i has staggered.
My staggered setup would kick my AWD light whenever i took the car to the track and was driving over 110MPH.
other than that, no problem.

But i now have 10.5 +35 setup all around, running 275/30/20.
with that setup, i am able to get the deep concave all around which looks more aggressive than any staggered setup could ever!