This is with stock springs.
I could fit my hand vertically between tire and fender.
Now I can only fit my hand in horizontally. It's about 2-1/2 inches lower.
I don't have (or can't seem to find) any pictures of it lowered on the stock wheels though.
Basically it makes the reveal around the tire equal.
As for springs vs coilovers, the springs will get you lowered and are Toyota approved. They will definitely get you the looks that your looking for!
We have Koni struts (great brand) that might be a touch too tall. What I mean is that the TRD springs and the Koni struts were probably not engineered to go together. IMO (Please do your due diligence and correct me if I'm wrong)
Coilovers are an engineered unit. Spring rate in tune with dampening. Some of them have adjustable camber settings. This is where you can fine tune everything to your liking.
TRD springs made a HUGE difference in the handling characteristics of the car. But I want more! (OCD)
Not to mention the cool guy status! (Jk)
I'll take some pics with a tape measure to give you an idea. Just keep in mind that I'm on 18's now and not as low as on OEM wheels.