It seems that many people ascribe to utilitarianism, or at least use it as a paradigm for ethical arguments, online. What other ethical models might one use, and is there any objective way to establish which is the best model?

I remember liking Kant's ethics, which i may be poorly remembering, as saying the ethics are in the act itself, not the outcomes, and his maxim to only do that which you wish to become a universal rule. I don't know if there is a name for that... deontological ethics, maybe?

I also recall that i took issue with the utilitarian model, because of the unknowability of outcomes. Is that still debated or is there some development that makes the point moot?