I was as frustrated as you are with brake dust but I loved the cold bite and stopping characteristics of the BMW pad so it took me a while to pull the trigger on aftermarket pads. I settled with the StopTech Street Performance pads and I'm very happy so far. IMO, they are 80-90% similar to BMW pads in stopping power but have 80-90% less dust. rockauto has the best prices.
2007 530 xi
2004 X3 3.0i