I will try to get a measurement of how much room I've got between the tire and the spring when I get home.
Also, to give you an idea of how much room for adjustment I have if I ever wanted to lower the car further, here's a shot of the coilover. This is at the height I've been running for the last year, which you already know is pretty low. So, judging by the picture, I could damn near set the car down on the frame rails.