I was looking at MOV*IT brakes and it looks like they make good solid brake systems. I don't know too much about this company and want to see if you guys have had any experience with this company. The have brake kits for e9x M3s in a few different sizes.
370mm with 6 piston caliper
342mm with 6 piston caliper
342mm with 4 piston caliper
They are offering CER kits as well and rotors can be made in any size.