There are basically 2 parts to suspension,
springs
dampers
both these together are a coilover, as the spring (coil) sit over the damper.
You can lower you car just by changing the springs keeping you original dampers or you can change both the dampers and springs which would allow you to adjust all aspects of the suspension. How hard it is, camber, rebound rate and loads more. Helps if you know what your doing with these set ups.
It depends on what set up you are looking for. If it just looks over adjustability I would save some cash and just lower it by changing the springs to Eibach or H&R.