I don't think there is a high quality 11.75 rotor available anymore. The best ones used to be the OEM rotors made in Canada. Those were available until roughly the year 2000. Since then it has just been junk. The Chinese junk works okay for a daily driver as long as you aren't making a lot of power and pushing triple digit speeds.

I upgrade any car I build to 13 inch rotors with Brembo calipers but most people don't want to go to that effort since it is a fairly complicated project. I had Viper brakes on my Duster and those worked great. I run Porsche twin turbo brakes on my '65 Coronet.