Wow, cross drill your own rotors, I would definitely no suggest it... This is what this dude at a local shop said about x-drilled rotors, "Cross drilled rotors are made with a special, harder metal than regular stock rotors. That way they will withstand the pressure of regular braking without being warped easily. However, x-drilled rotors are always going to be very vulnerable to warp under heavy usage, like if you're autocrossing all the time ets. If I had to choose, I would get slotted over x-drilled"
I took his word because he looked like he knew his stuff since he had a top fuel drag car in his shop and a few RX7's and hondas laying around with engine swaps being worked on etc...
Needless to say, I have slotted rotors waiting till I finish killing my x-drilled by this summer.