well the cheapest way would be to just get springs and ride your stock shocks for a while. it would lower it to about that height. eibach sportlines are smooth. you might wanna try those. but save up for some shocks later though. you'll need'em
i didnt mean to scare you about all the settings getting crazy. it doesnt make the car NOT DRIVABLE or anything. i just wanted to mention what happens to the settings. but IF you were to gather the suspension pieces you needed, and you adjusted the suspension all back to 0's then it would be nicer on your tires during the daily drive
