What size rotors?

I know there are those that say, bigger is better. Talking to Ian at CAV Canada, he has mentioned that on my CAV, I can upsize my rotors to either 12" or 13". He did mention that going to a 13", though will fit under the 17" rims, may rob horsepower due to weight. I do track this car, just want to know the best choice for what I will be doing to this car.

Also, a second quick question, do I want to have the same size rotors front and rear? I do have the proportioning valve and the same calipers front and rear now.

Thoughts?
 
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