Give this thread a read.
http://www.ft86club.com/forums/showthread.php?t=67345 The guy knows of what he speaks. It may give you some insight into the compromises that you must make when you make changes to your car (and every mod is a compromise of some kind).
Remember that every scrape does some damage to a part of your car. If it is a plastic lip then it is not that big a deal. That is just aesthetics. If it is a pinch seam then it is removing paint and exposing bare metal which will eventually begin to rust. If it is the exhaust then it will eventually lead to a hole which will leak. If you care about the longevity of your car then you want to avoid scraping.
I installed RCE yellows on my son's FR-S which gave a .75 inch drop. I run coilovers and a 1.25 inch drop on my MR2 Spyder. Both cars looks a little better IMO. The FR-S never seems to scrape. The Spyder almost never scrapes anything unless going into or out of a steep drive where the front lip may touch. Both drops are modest enough to not mess up the suspension geometry and both cars were properly aligned after lowering.