There are other options. Have you considered them?
The Warmonger kit is in the group buy area right now. It uses the 300 mm Focus SVT front rotor with your factory front calipers. It is accomplished with adapter brackets using the SVT or Cougar factory brackets. The rears use the Contour SVT or Cougar 280 mm front rotors, again using adapter brackets with the factory brackets and your original rear calipers.
So you end up with 300 mm fronts and 280 mm rears.
Another alternative is to use the Focus SVT calipers, brackets, and rotors. They are nearly a bolt on except for minor spacing issues solved with stainless steel washers. The Focus SVT rears don't seem to be as compatable so no one has tried to use them, but of course, you can use the rear part of the Warmonger kit with this.
Factory 16" wheels fit over the Warmonger kit or the Focus SVT setup.
The two you mentioned are fronts only. The Bear uses a Mustang front caliper with their own brackets and 13" unique rotors. 17" wheels are required. Wilwoods are available in both 12" and 13" rotors. From what I understand wheel selection is limited due to offset concerns. Maybe someone else with more familarity can expand on this.
Also someone here (Stazi, I think) has a rear big kit that uses component rotors.
The best bang for the buck is the Warmonger kit.