I use ii2 to manage LaTeX software for the back end, and I used both TextMate (it has a very good LaTeX package) and Emacs (with Auctex) as front ends.
You can get a good experience with LaTeX in Emacs using the Aquamacs distribution (I can't use it because I have a non-English keyboard without being tied to Aquamacs, which makes it impossible to use Aquamacs and the @ symbol at the same time for me).
, , , , LaTeX Companion. .
LaTeX Mac:
Mac- LaTeX, Mactex.