Running 12s is going to be more a result of your supporting mods / driving ability than it will be which turbo you choose. I think the Evo III 16g would be a wise choice. I would highly suggest you look into a good suspension setup along with some Prothane motor mounts if you havent already. An LSD wouldnt hurt either. Making loads of power with a huge turbo is much less important than putting the power you have to the ground. If you go and slap an FP Green on without the proper supporting mods, expect your times to be in the neighborhood of 13.9@111mph