I'm sure you've already seen this, but just to throw it up:
http://www.carbotecheng.com/prod-ct-compounds.htm
I don't have any personal experience with the pad but I have heard good things about them. But to tell the truth they aren't all that different compared to the Ultimates that you're already running. Ultimates have a temp range of ambient - 950F while the P+ go from 150-1250F. So you're just moving the range up a little bit. It really depends upon what you want as your first priority track or street driving? Since the P+'s do squeak and dust just as bad as the Ultimates and you need to give them a second to warm up when you do stomp on them for the street.
Pads are something that's quite easy to change, and if you get a track set of wheels/tires makes it even easier to change since you're already swapping out the wheels. I'd keep what you have now until you have some fade issues with it and then decide what you want to do at that point. Esp since your car should have enough ground clearance to add in some ducting to the brake calipers to take away some of the heat for your track days. In the end I'd say don't fix what ain't broke, but what do I know. I have a set of OEM, Cobalt Friction GT-Sports and Cobalt Friction Spec VR's in the garage. lol
If you search for it on H-T autocross/roadrace section you'll find some reviews of the compound.