Goat = soft, textured all over, slightly water resistant
Lamb = insanely soft, usually smooth (with some natural graining here and there) and not as water resistant. The lamb, though, is the one that people put their hands on and can't get enough of. I think as most can attest to here, the TOJ lamb will make you new friends, whether you want it to, or not.
Zippers: prefer the look of the silver, and the one-way operation is lighter and smoother than the two-way antiques. I just prefer them a whole lot more. It's worth considering what color leather you want first though, and then deciding on the zipper color.
We haven't set it in stone yet, but me and Charly were doing numbers and it's somewhere between those two figures. We haven't figured in a foreign exchange loss rate yet, so still subject to change.