As far as slotted rotors go all they do is help dissipate the heat!
No they don't. Nothing on the rotors surface actually cools the rotor. The main cooling is done internally with the vents. Air is sucked in the backside of the rotor and centrifigal motion flings the air outwards drawing more air in. It's a centrifigal pump.
The slots and drilled holes do not cool. They arent even in the correct orientation to do much.
Drilled holes are for pads which expell gases under high temperatures. These are usually race pads. Very few street cars come with high-performance pads which expel gas (porsche, ferrari, etc)
Slotted rotors help "wipe" off excess brake dust from the surface of the rotor. They just give the dust a channel to escape from. Pads can sometimes create more dist due to the ridges of the slots cutting into the pad on each stroke.
But other than that they do nothing for cooling. The biggest thing for cooling is the mass of the rotor. It's why plain non-drilled rotors offer the best performance overall. They have the most mass, and the most pad swept surface area.
For those of you with 13" Cobra brakes, you will notice that after driving around, if you touch your rotors they will still be very cool (unless you were just stopping from 80MPH+). That's the mass of the rotor spreading the heat all around and cooling it.
I recommend normal Brembo blank rotors. They are cheap, well made and quality rotors. Pads are up to you. I've had hawks and they can be slightly noisy. On a street car i usually say stick with Ford OEM (not motorscraft). They are usually made by PBR on the newer stangs