do you own a wok?
i love using mine. can throw anything in there cook it and add some sauce and dump it over rice. mmmmm mmmmm
i have fish, oyster, hoisin, teriaki, soy and usually add those with other ingredients to make sauce. things like ginger or garlic. sounds like you sort of do this already.
go to the international isle of your grocery store and there are tons more sauces. india and thai will give you lots of options. curries from both are good, but there are a ton.