when i purchased my saint brakes from universal they came with both 6 bolt and centerlock rotors. shimano makes both. i'm using mine on outlaws.
you can use hayes rotors with saint brakes. i purchased 203mm rotors for both front and rear. the fit of the 203mm was marginal on my rear brake, so i fit a hayes 160mm and it works fine.
the trick is: shimano brakes have a slightly narower pad width, so you cannot use shimano rotors with many other brakes, as it will groove the pads. you can however use shimano brakes with other brands of rotors, the pads will simply contact a slightly narower width of the rotors.