I went with the HPA 392/728, but it hasn't shipped yet...hopefully within the next week.
Got the H&R 20mm rear ASB, M3 subframe bushings, and the Quaife pumpkin from VAC all sitting in my garage, but my installer wants to wait for the coilovers and do everything at once.
I'll let everyone know how it turns out. Thanks again to Doyle and everybody else who offered advice
Cobb/PTF Stage 3, RB Turbos, Aquamist HSF-4, CM FX850 Twin, Quaife LSD, CP-E Catless DPs, ETS 7" FMIC, Stett CAI v2, Stett CP/Forge DV, BMS OCC, UUC Evo3, Koni/TCK/Swift/Vorshlag Suspension, 20mm H&R Rear ASB, Megan Racing control arms, M3 SF bushings, 18" OZ Alleggerita w PSS, BSW S1 on Logic7, Musicars 12" sub Coming soon: WOTbox, Stett Oil Cooler