Stock Rotors are just as good as the drilled or slotted.. sometimes better!
Go with ATE
The pads are more important then the rotors.. and most of all your calipers must be in excellent working condition
Don't forget to bleed the breaks completely.. i just got a bavauto break bleeder if you need to borrow it.
E30 Stuff For Sale: Clutch Fan and Shroud, 4 Pack Ignition Coils, ATE 750il MC (New), Offset Trailing Arm Bushings, m42 Valve Cover (Clean), M10 Engine Mounts (New), M42 Injectors,