Went with Hella Pagid high carbon coated rotors, and Textar pads. Also finally getting the chance to upgrade the tiny 525d brakes to the much larger 530/540 ones. Got the calipers from
OEM 2-piece Brake Rotor - F10 F12 F06
Pagid 2-Piece Brake Rotors
BMW E39 5-Series Brake Kit By Pagid W/ Ceramic Pads & Sensor
Pagid Brake Discs | Halfords UK
One New Pagid Disc Brake Rotor Front Right 355120891 for BMW | eBay
VW Brake Kit - Pagid KIT-534856KT9 | FCP Euro
Brake Pads – Pagid
Pagid Brake Pads For Racing | Cantrell Motorsports Bellevue WA