Start with Subframe Bushings....that will make a good firm base to start with. If you're looking for good drag performance.....go with solid bushings (no it will not negatively affect your ride comfort). And personally, while you have the subframe lowered....I would change out the upper control arm bushings. JDP Motorsports sells a nice replacement bracket with new bushings already pressed in.
You're choices for the solid Subframe Bushings are PFADT, ADM Performance, and LG Motorsports.
http://store.pfadtracing.com/2010-ca...rame-bushings/
http://www.admperformance.com/produc...63&product=258
http://www.lgmotorsports.com/product...oducts_id=2653