@cicerone imposter,
In the Freudian model, the ego is one of three parts of the mind, with the other parts being the id and super-ego, both largely inconscious. Other structures have been proposed for the mind, like the child / adult / parent of transactional analysis, or the 'committee model' where varied thought centers share the same 'mental board room' where they debate. These models have all a piece of the truth IMO.
To me, the important aspect of how our mind functions is its reflexivity: like a mirror of ourselves, we reflect our own thoughts (hence the two meanings of the word 'reflection': optical and mental). We can hear ourself thinking, visualize stuff that we imagine. This happens within some 'space' usually called 'conscience'. That's why I like the term 'self': it conveys that reflexivity. But the term is also weak if one agrees with Freud, as I do, that there are inconscient thoughts. So maybe the terms 'person' or 'mind' are better, more general...