I'm in the process of redoing the suspension on my wife's 528i. I have a set of Koni single adjustables ordered from Eric at supremepowerparts.com, and I already have a set of Intrax springs waiting for the Konis to come in. Need to find a good set of sway bars and strut braces to go with them...
How about changing out the moldings and window trim for the Shadowline (all black) ones? It'll make the car look a lot more aggressive...