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just buy the cheap NAPA rotors, you can get 1-2 hard races out of them before they need to be replaced...most guys that run scca or a track day will need to replace pads, rotors and fluid after 1-2 races..
I have d/s rotors I use for the street. For track days, I use the stock rotors w/track pads. I scan the For Sale section as people are always selling their stock rotors when the repl with the d/s. I usually get them for around $35 plus shipping for fronts or $50 for all 4. The NAPA route is pretty good way to go. CF members get disc at Rock Auto, and they have the best price, but shipping will just kill you. Good luck.
You will get some good info asking this in the road race/autox forum.
The stock brakes, as you know are great. They do crack some, but it is still a lot cheaper in time and money to use the stock setup and just replace them at they crack. I do that, I have several sets just waiting for the summer. But, with your location it may be a little more expensive.
The big brake kits can still crack. But, yes if you can get a good setup they should do that less often.
How often do you crack a rotor? That will give someone who knows more than me a little insight to your driving.
Do you have brake duct extenders and spindle ducts? I would do that before changing the brakes. It will help the life of the rotors.