Elixir master used to be the go to specialization for alchemy because raiders need them all the time. For whatever reason guilds hoard their own elixirs now so there is not so much demand. Potions like Virmen's Bite make good gold for PvPers. I make about 5000g a day just by crafting those.
Living Steel transmutes were hot in the start of MoP by crafters, I don't know how the market is right now.