+1 for Eibach Pro-kit springs. I went with the Eibach's over H&R because of the OEM ride quality. I installed springs over a year ago and have 11 track days so far. The ride quality is the same as OEM springs, with no bouncing or harshness as with some lowering springs. They do not lower as much as H&R, but then trade off is OEM ride quality.
Akra Evo / MS stage 2 / MS UDP / VF Tune / KW S/O springs / Vorshlag plates / ST 380/355 BBK / ST SR34 pads / Apex Arc-8 / Nitto NT01 / Cantrell Motorsports roll cage / Recaro Profi / Schroth Profi II-6 / BMW Performance Alcantera wheel