I did the 07+ brake upgrade in the front and ran slotted and cross drilled all around. I don't have any issues with cracking of the rotors and stopping with the 26s. it's been said slotted rotor will give you more surface contact then a slotted/drilled rotor but brake motive did some testing and found a drilled rotor will actually perform better and keep the brakes cooler during stopping then a slotted or a normal rotor.
I got the rotors and pads from brake motive, they are a sponsor on the camaro forum and I am actually running a set of slotted rotors on my camaro as well.
here is a link to there ebay page
http://stores.ebay.com/Brakemotive
if you want to know more about the 07+ upgrade do a search thats how I learned about it. My next plans are to try the baer or wilwood kit so I can get some calipers and rotors to fill up the massive wheels.