Springs and decent dampers work well and will cost less than coils.
Eibach and Racing Beat springs both offer about a 1" drop. The ride quality doesn't firm up that much either. Pair them with some Koni Sport Active dampers and you'll have a ride quality that's as good, if not better, as the OEM setup.
I'll add another +1... Just put Eibach prokit in my car and it's better from every aspect. Just remember though it won't look slammed just right