lv6l

hey people, i need some suggestions on a lowering job i'm planning to do. i'm planning to lower a 2001 lexus gs. the rims on it is 19" i would like to ask what is a good lowering spring or inch i can lower it to before it gets too low where its hard to drive over things and to not let the wheel hit the inside of the car. i saw some on the streets, some looks very nice where the car is lower to a point where the wheels look slightly tilt in, i kind of want it like that but not too much. i saw eibach lowering at 1.2" for pro and 1.4" for sport, i was planning on going with tein but saw that it was lowring at 1.9"F and 1.7"R and wonder if thats too low. so i need your guys's help on this, i know this is honda and acura but i would greatly appreicated if you can help me. thanks.