If you want to lower, and maintain ride quality, stick with spindles, and/or torsion keys. spindles will obviously raise the spindle height, with no effect on ride quality, and keys will re-index your torsion bars without increasing tension/reducing travel. In the rear, shackles and hangers will raise your axle, and maintain your original spring rates. higher pressure shocks are better suited to more extreme drops (and handling) to control compression and rebound in limited travel situations. In any scenario, bump stop heights must be addressed (reduced) as well.
Another major factor is tire profile, the shorter the sidewall, the stiffer the ride. This is the most overlooked area concerning ride quality. Shorter profile tires with huge rims are a look, but 30, 40, and 45 series performance tires are not known for thier ride characteristics.
Everything is a comprimise, and you have to weigh how much how much you are willing to give up for the look/performance that you want.