#1) 7.5
#2) yes
#3) There are alot, Eibach, is cheap and good, other than that Tien, Tenabe, and a few others.
#4) Here's the problem with Tony's magic numbers:
You can only go so far with the stock camber adjustments anyway. I dropped a hair over an inch, all around. And the stock camber lobes were adjusted all the way to max to barely bring it back into to spec. His magic numbers only work from the stock ride height. Other than that, if you drop the car, you'll be good to just bring it back into spec. There won't be anymore adjustment to go any further.