What look are you going for? That'll determine your route.
If you want a tall tire, go 275/65/20, 285/75/17, 285/70/18, etc.
If you want a wide tire go 305/55/20, 305/70/17 305/65/18, etc.
To fit all of the above you're probably looking at a 2.5" leveling kit at least and probably something for the rear, maybe 1" or 1.5".
I had to trim plastic for clearance at each wheel position and had to hammer some metal for the fronts. Other than that, I've been on the setup in my sig for ~1 year with only slight rubbing in the back when severely off camber.