I got my brakes from a VW aftermarket distributor (ecs tuning) and they slot/zinc plate then resell the Brembo sports. I run them with Hawk Ceramics and OMG! do they bring the dub to a stop.
I also have Powerslots on my old GTI and Mintex pads, and that's a track car. Powerslots are excellent rotors for the price. I'll also 2nd/3rd/4th the 'slotted over drilled' conversation. IMO, people that buy drilled rotors do it because it "looks cool" and have no idea about the performance aspect.
I'm currently saving up my money for some cadmium-plated, cryo-treated rotors.
Frozen Rotors - High Performance Brake Pads, Brake Rotors