I think Brembo makes stock size rotors for the Legacies, with some Hawk or Carbotech pads. I've had excellent luck with both. Also, you can try some Castrol GT-LMA brake fluid, its cheap but works well and can be found at better auto parts stores. That has worked for me in the past with good results.
I wouldn't go all out for cross drilled or slotted rotors unless you are taking the car to a road course on a frequent basis.