Buy the 4.6is brakes I have in the For Sale Forum!! You can have them powdercoated as well to really complete the look. I have a place to send them to for powdercoating.
If you want you could also buy cross drilled rotors:
http://www.raceshopper.com/sp_rotors.shtml
They do have the cross drilled for the fronts for the 4.6is and they were supposed to get the rears in stock in December.....
My 4.6is calipers: $700 shipped (No rotors), $450 powder coating, pads @$140, rotors $450
That way you will have powder coated 4.6is brakes with cross drilled rotors for $1,740.... pretty good deal!!! Great stopping power and an awsome look!!! Much less than the Brembos for $6,500!!
http://www.xoutpost.com/x5-e53-forum/...-calipers.html