Well, I had H&R Sport Springs on the car, which were advertised as a 1.75" drop in front and 1.5" drop in rear, and they caused rubbing with my 205/45-16 tires. It was also annoying to drive around the city like that, constantly needing to slow to a crawl over bumps.
So if I drop the car again, I want it no lower than a 1.25" drop in the front and rear.
-Jeff