First of all, you do not want cross drilled rotors unless you are paying big $$$ for a Baer set up. Rotors are not something that you want to go cheap on. Believe me, I know from experience. Those rotors will crack as soon as they get hot and then you will be buying new ones all over again. I just got done doing brakes all the way around and from all my research, I HIGHLY recommend the EBC slotted and dimpled rotors and a good pad. Also remember, that these trucks do about 80% of braking up front. So there is really no need to upgrade the rear rotors. If you are looking for a nice brake upgrade, I would spend some $$ and get a quality set of front rotors and then do high end pads all the way around. That will keep more money in your pocket and will make a nice upgrade from the very ****** OEM brakes. I noticed a very noticeable difference with my EBC set up. And like I have said before concerning the OEM set up, you know the brakes are ****** when the pads outlast the rotor.
My recommendation is to stay away from anything cross drilled and anything on eBay as far as brakes go. SSBC, EBC, Baer and Brembo are all top notch. Powerslot rotors are ok, but compared to EBC they will only last about half as long.