That looks ok not lowered, i want 20's and do not wish to lower it!!. some places around town (and at my work) you would rip the bumper off going down some ramps (the ramp at work has beached trucks!!!) standard heights cars scrape on it crabbing and going slow!!.
really OP - your car do what you want, if you get the 20's and think "i don't like it" then lower it