I have Tanabe GF210 springs and a set of TRD yellow sways. The springs lowered the car between 1 1/2" and 2".
I had a set of LTuned springs before, but they didn't drop the car as much as I wanted them to. They were definitely stiff and felt great on turns though.
The Tanabe's are much lighter and softer than the LTuneds, but the drop is perfect! The sways make driving so much more fun. I highly recommend them. Since my shocks are still fairly new (3K miles), I won't upgrade those until I need to, or until I get some more $$. ;)
Sorry, I don't know much about full suspension systems.