Check out Import Specialist on 96th and Michigan Rd.
http://www.bimmershops.com/indiana/import-specialist
I have an appt next week for Koni+Eibach install, and 60K service. Spoke with Bob twice on the phone and the guy sounded very competent, and charges at least a third less than what Dreyer & Reinbold's stealership charges for labor.
Will report back on my experience, but looks like people with BMWs like them, and Bob does performance upgrades.