[grego37]

Drilled rotors are for appearance reasons only.
Not for performance use.
The pads that are avail today dont expell the gases they used to.
They are prone to stress cracks at each hole. They are more prone to warpage. They have to be surfaced more frequently, and go through pads more often.

They look good , and provide better wet braking.
(how often do you drive in the rain)
But all the other cons outweigh the pros.

If you must do something , consider having them slotted.
Use as big as a rotor you can fit.
Dont take my word for it, do more research on your own .