It all depends on what type of ride your looking for or even how many people will you be driving most of the time with.
I'm on D2 Racing coilovers, I have it set up for my family (wife & 2 girls). With everyone in the car I'm able to tuck a 285/30 tire on a 20x10 wheel.
While the ride got a little stiffer from the oem set up on bad city streets it has become a night & day difference on the highway (no more buick floating, even at very high speeds).
I now enjoy the car more with the coilover (looks much better) but I wish they would fix all the pot-holes in my town.
