Lowering your car will make the ride different. You just get use to it after a while. Some part of the ride quality depends on what type of springs you choose, and if you go with the coils system that will also be different. All comes down to whagt you buy.
Personal if you go springs only and if you want good drop, get Tein S as they drop lower than your Tanabe, H&R and F -Sports although i'm not sure about the ride comfort. If you get Coils you won't need to think about drop, as you can taylor the drop just what brand you want.