I think you'd be happy with Koni's and a set of springs to go with it. Would cost you maybe 700-1k.
I'll give you a ride in my car one day, I have the HPA kit which is Koni's + Swift springs but the ability adjust height / dampening. I also set it once and forget about it.
It is stiff but I like it.
Current: 2012 335iS
Past: 2006 e90 325xi, 2010 135i