Be careful with the 285/30/20, most of those tires will be about an inch shorter than stock. If you are lowered, it will look great. But if you are stock suspension, there will probably be some hefty wheel gap.I've seen a few cars with that setup. It seems like 275/35 or 285/30 is more common with the 20" wheel though
I've ran both 285/30 (goodyear supercar 3)
and a 285/35 (PSS)
If you are not lowered, I'd def go for the taller 35 series tire.