or get a custom thicker made disc, and if ure caliper is a 2 piece design and ure willing to spend a bit, get an engineering company to make a plate to go between the 2 halves to allow for the thicker disc...
And for eye popping power you could get some custom ceramic pads, damn expencive but amazing stoping power and easier on the disc.
I ride street and park to, I have only wrecked 1 disc.
And usually when you hit a disc when riding street they go pretty bad. Like from missing your back wheel and your rotor coming down on a curb.
No disc can stand up to that unless you want to run a car disc break, lol.
I could see how DH riders could spend the extra cash on a strong thick rotor. They can handle more heat without warping and can take things like hitting small trees and sticks.
For street, I would just stick with a cheap rotor. Not worth it, first time you mess up and hit is, it's gunna go no matter how much you spent on it.