yes, go to o'brien. I had a stone chip on my windscreen as well and got it fixed through o'brien, and now hardly can be seen from outside, only visible from inside at certain angle. But it can't be too small, and it can't be too big. cost $100 I think, can't remember exactly, but not overly expensive. I can certainly recommend it.
oh, and put a cellotape on the stone chip to prevent more dust coming in/sticking on the crack surface until you get it fixed.

