If you have managed to warp 2 sets then the standard brakes are not upto your style of driving, i would suggest spending a bit more than you wanted to and get a decent brake kit upgrade, i have the godspeed 335mm kit on mine and have used them on track days without any problems, i did warp a set of discs after 3 years but i think that was probably me keeping my foot on the brakes when i've stopped so the heat transfers to the discs in one spot and warps them