That's a very broad question... I could tell you that a +30 offset will work with a 215 without rubbing, but just as with everyone else that discusses low offsets I'll probably be called an idiot. Why don't you give us an idea of what size tire you're hoping to run and we'll help you with offset? Or the other way around.
I am running the same suspension set-up with the L-tuned Rims that are 18x7.5 +42mm. I run a 225/40/18 and don't rub. I am going to throw some 17x8 +30mm rims in the rear for the track soon and I will see how that fits. Hope this helps some.