^ Yea, about the slotted rear rotors, arent the front rotors usually larger and basically better.
The pontiac G8 (Zeta, same platform) has larger rear rotors. Link to G8 test
Interestingly, while all four of the G8's discs are ventilated, the rear pair is slightly larger in diameter than the fronts. It's not a big difference (12.64 vs. 12.76 inches, a measly 3 millimeters) and the fronts are clamped by twin-piston calipers while the rears get single-piston units, but it is an interesting engineering choice.