1) yup
2) gear ratios in the SiR 1 and better
3) one is cable one is hydro, and they have a very slight difference in gearing
4) I would just get the stock LSD with the SiR 1 tranny....if not, I recomend quaife
5) seems like a good setup to me. the only tranny I could think of that I would rather have would be a b17a1 tranny with a quaife LSD