When they say 1.5" drop, it's from stock height usually. I wouldn't recommend any adjustable sprints (or sleeve coilovers) but if you absolutely must, I've heard that Skunk2 and Ground Control are okay.
I'd get some H&R OEM springs, because they bring you up almost to stock, but are about .75"-1" lower, so you still have a semi-aggressive stance but aren't scraping everywhere.