I'd think it is most likely warped front rotors even though I have heard glazing can cause some of the same symptoms. As far as replacement, I have had better luck with aftermarket pads/rotors. We have Brembo Rotors with Akebono Ceramic pads all the way around on our LC and they are great at 40k miles.
I am currently trying to find a good rotor to put on the front of my truck, I just replaced the rears with R1 concepts blank rotors but I need a good, solid rotor for the front cause I punish them a lot and the brembos are fairly expensive.
Loose (improper preload) or worn front bearings can also cause a disc wobble and might be a more common problem on the 100 especially at 128k.
I would also inspect the entire front suspension. When the brakes are applied there is a weight shift to the front that could have interesting effects that are associated with braking but not caused by braking.