I'm running the superb Eibach pro-kit on my 1M and love it
Lowers -25mm on the front and -15mm on the rear which makes the car look better as it reduces the massive gap on the front arches! Ride quality is vastly improved and handling feels sharper once the geometry is set-up (to accurate standard spec)
We're a Uk Eibach approved dealer and fitting centre so if you want some prices please just PM me. I will post a picture up when I'm back in the office on Thursday.
Cheers, Chris