1) plain faced rotors has the most surface area, but look boring. most surface area = best braking.
2) drilled are just that, drilled into the rotor. These create stress cracks not visible to the eye and are only recommended for street driving under normal conditions. yes, these do help escape gasses that may build up for a better initial bite, but thereafter, there is less surface area. Brake dust can also build up in the vanes inside the rotors, which would diminish cooling, but most dust escapes.
Porsche is the only company i know that cast the holes in the rotors, therefore, no structural integrity is lost. Drilled to me looks awesome, which is why I have drilled and slotted.
There are a handful of people that have cracked rotors, but it is rare. It's usually under heavy driving or towing. I never had any issues, just go with a good brand.
cross drilled does eat up pads a little more as it's like "grating cheese" but that never bothered me.
3) slotted. best of both worlds, as good surface area and still escape routes for gasses for initial bite. so wet braking, etc... is better with initial bite. slots do make a distinctive sound. i love it, some hate it. these do reduce pad life as well.
these are harder to turn, but i personally never turn rotors and just buy new rotors when it's time.
4) drilled/slotted - what I personally get.
If you're a normal driver, drilled/slotted is good. If you're a heavy driver, slotted. Then last, plain - just because slotted looks better with no structural integrity loss.
note, it's pretty much the tires and pads that do the stopping -- if that's your #1 concern.
Thanks fellas I'm probably going to go with the StopTech lines.
On another note how do some of you feel about stock vs drilled vs drilled and slotted vs slotted rotors? A lot of info on the net, so much that it's hard to differentiate fact from myth.