It sounds like the BMW performance suspension would be a good match for your requirements. However its not the best value for money compared to buying springs and dampers separately. Since our Australian roads aren't great, you will probably want to get rid of the runflat tires quite soon after making the change.
Did you see this thread showing the Eibach pro kit and H&R OE sport?
http://www.1addicts.com/forums/showthread.php?t=343630
Adding anti roll bars is a very good idea for a comfort oriented setup because it adds body control with almost no penalty in ride quality. The front bar is simple and cheap to install, but unfortunately the rear bar installation is a much bigger job. If you just want to install the front bar it won't be hard to find a used M-sport front bar because so many people have upgraded. It may be possible to go straight for the E92 M3 front bar, but I just don't know if you will notice any issues due to being without any rear bar.