Do not lower the car if you don't want worse ride quality and handling.
The only thing that will handle better than stock and maintain a good ride is something like Ohlins rt or a properly setup jrz coilover. Both of which cost over 3000
Best mod for handling is oem zcp suspension and camber plates with good tires. Stick with oem suspension and plates. There are tons of reviews on the sleeve kit and aftermarket springs proving that the setup is worse than stock.
Anything lower than zcp/dinan (basically same drop) is asking for trouble when used with oem or lower quality shocks.