Transmute spec alchemist is my suggestion. Currently it's not profitable to transmute gems with the cosy of GL but I'm still betting that after the next tier drops that GL prices will drop and gem prices will go up. Not to mention alchemist are profitable in their own right.
Personally I'm too lazy to mess with professions while leveling and instead stock my personal guild bank with mats to power level professions when you level cap. That's a personal preference that admittedly costs gold, not sure how it would work out as GPH.