"warped rotors" is such an overused term.

It can be many reasons why your steering wheel shakes. Unevenly torqued or undertorqued/loose lug nuts can cause it. And i think its too much runout/unevenly worn rotors can cause it, thus resurfacing can fix it... if in doubt, double check the price on new rotors and see if its worth your while to just pickup new ones instead of resurfacing them. but I think resurfacing would be cheaper.