yeah that E39 M5 looks clean. But I've always been a fan of stagger set up on E39 and E38 bimmers. In my opinion stagger setup just give that perfect aggressive look to the car.
But squares are OK too. I guess it all comes down to the preference of the driver.
I am actually going to raise the rear about 1/4 of inch. I am having bad camber wear in the rear. I think I dropped it a little too low. I get about 10K-miles out of the tires, which is low. So I am going to bring rear up about 1/4 of inch and maybe run with 295x30x19 in the rear to fill in the space. If you are curios, I'll post an update after about 10K miles (one year or so).