Do you have a limited? I think the easiest/cheapest upgrade is to change them over to SRT-6 brakes. I do not know for sure, but I think all calipers are larger (I know the back are).

StopTech makes a kit as well that needswings sells: StopTech Big Brake Kit Front

If you are just hunting for brake pad recommendations, I have a limited and I am very happy with the Akebono Ceramic (less brake dust). I put Brembo blank rotors along with the pads and do not have any issues with the stopping power.