LMAO! I know the feeling. Look more into that Spec/Fidanza deal. I think you should be able to find it in the Transaxle section.
I like what Demon said about the bias difference between the Quaife and Torsen, the Quaife being 2:1 and Torsen 3:1. What that does is give you more smooth launches and less torque steer. (I believe, you may want to look into that too.) I think the Torsen is cheaper but I'm not sure.
However, the Quaife comes with an unconditional life-time guarantee. That's hard to beat with a stick but will you need it? I don't know...
