The ones I am getting are not drilled, only slotted. I rdid some research, and it seems that drilled+slotted is not a good combination (it weakens the rotors too much), and slotted are better than drilled (stronger, less cracking) while being just as efficient in releasing gases and dissipating heat (meaning they are more efficient at stopping).
Slotted rotors also suppossedly clean the braking system from dust and are better at getting water out of the system, meaning more braking efficiency when wet versus standard rotors. I also decided to go with a well known brand (in this case, Brembo) to make sure the rotors will be top quality.
I AM building my rig based onthe assumption that it will be used in hot weather only, as I am currently living in Miami FL, and I will be taking it down to Panama, Central America. So I doubt this rig will ever see any snow.
But thanks for the warning anyway!
Felipe