One more thing to consider: If the pedal itself is not pulsing strongly and you feel it in the steering wheel, it is likely control arm bushings. I had severe steering wheel shimmy and it was the front wishbone arms (the funny curved ones). I replaced with TRW M3 bits and it's fixed.
I now have a brake pedal vibration, but that's more a function of cheap rotors and not doing bed-in properly I think than anything.
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