Best pads to use on W204 C63

[nightSpirit]

I have my edition 507 (black series brakes as stock I believe) and it looks like I need new pads on the rear soon? I've got 6-7 track days planned this year including a 2 day stint on the Nordschleife. Can someone tell me which pads are best for road and some track use? I've used EBC, Pagid, AP and Endless pads in the past on other cars and want something that's decent.

Any links to purchase welcome!