I just got TRD's installed and the ride quality doesn't suffer too much at all. They will settle a little over time - might get a max of 1.2" drop all around. Perfect for me
If you get TRD
you don't have to change your shocks and you will not loose lot of comfort it's the good part , but drop not that low (For my taste).
And it's true that lower you go more comfort you loose...
And if you really like agressive drop go with Eibach Sportlines or Gold-Line springs. But if you like to slightly lower your car go with TRD
or Eibach Pro (I would take TRD
over the Eibach Pro)