Re: Warped = Surging/Pulsating?
Before you spend any money on those fancy crossdrilled and slotted rotors, ROTATE YOUR TIRES! I thought I needed rotors and pads and the like, then rotated my tires in a nice "X" pattern. Damn, was the improvement great! It feels like a brand new truck. BFG includes a bit of information with their mud terrains about that "up and down" treadwear. They say "rotate". I had that big time on my Buckshots in the front, but the rears were far better. You should be able to get an ass-load more mileage out of BFG's, after 10,000 miles it is just ludicrous to by new tires.
Once you get the tires moved around to their happy new homes, see if the brakes still pulsate. Mine stopped, hopefully yours will, too. But if you get a pulse in the pedal that correspnds with a shake in the wheel, welcome to rotor land!
I think that buying quality parts is always a better idea than saving money. If your brakes fail, and you are hurt or hurt someone else, I'm sure you would have rather spent the money. Not that rotors, or any other parts, just suddenly fall apart, but it is better to be safe. All that drilling and slot stuff is meant to reduce heat build-up, which is good for two reasons, longer life and less fade. When towing a trailer, brakes get freaking-hot and the slots and what-not help out in the dissipation of that heat. They also last longer because they are harder to warp.
Your Toyota definately didn't have the same appetite for tread lugs your "real man truck" does. I think all you need is a little bit of time to rotate and drive, if that doesn't help, you know there is a problem.
'99 Chevy Silverado K2500