Go to knsbrakes.com
Better brakes don't come with cross-drilled/slotted rotors. Upgrade your pads to better pads such as Hawk HPS or Ferrodos if they are made for the 2.5RS. Also, look to see if there are SS braided lines. And lastly, upgrade to Motul or ATE brake fluid.
Admittedly, I have crossdrilled front rotors on my STI, but they aren't there for performance. I just like the look and since I don't drive hard or track it, I'm not as worried about cracking.