I've got 19x8 rims. The only reason I got GC is because it looks so damn good...had H&Rs before with my 19s and never rubbed at all...even when I cruised on the interstate at 85, going over humps and bumps.
You could even run 19s with stock suspension, only if you like the 4x4 look.
Another thing I'm getting ready to do is take out my front wheel well liner if I can. That is the only place I rub when I hit bumps on the highway.
If you are looking to have one dope azz CSVT, get the GC/Koni with your 19s.
I've been told that 225/35 Parada Spec 2 are pretty sticky. Someone is running them with 19x8 Axis NE-Os. I have 215/35 Pirelli Super Sport which wear really well and stick ok.