I have one of the above mentioned suspension kits. I'm at 60mm front, 40mm back, and I have 15x7J ET37 wheels all round, I get rubbing at the back when the road surface is uneven. This is because I'm running 20mm spacers at the back. I tend not to worry though, I'm pretty used to rubbing now.
*free plug* I have a set of H&R springs lying around somewhere. They lower the car about 35mm-ish. Much better than most other brands. I noticed a subtle change in ride quality with them on. They were very good. Shame, since I wanted to go lower. It's like a habit, I guess
