I have 18" wheels with Eibach's Sportline springs (1.4" drop).
At first I liked it, but after 5 months I'm switching to Eibach's Pro-Kit (1" drop).
1.4" look dropped almost too much. The Pro-Kit has a more even and natural looking wheel gap.
This thread talks about the gap spacing a little more:
http://www.ft86club.com/forums/showthread.php?t=57106