2 cents. The mind is an abstraction. The subject is an abstraction. Matter is an abstraction. Consciousness is an abstraction. If you want a fundamental ontology, and what philosopher doesn't, you have to dig deeper than the mind.
The mind/subject is fine for practical purposes, but is dialectically vulnerable. It doesn't hold water. Hegel started the demolition. Wittgenstein and Heidegger finished it. Or maybe Parmenides finished it. Or maybe Buddha.
Of course this is all just my opinion, but I can say that I have thought on exactly this sort of issue for many years now. Mathematics also ties into this. The realm of concept is simply radically different than the realm of sensation and emotion, but this becomes pseudo-invisible because sensation and emotion are mediated by conceptualization. The problem of universals is central to philosophy and to the escape from the itch and entanglement of strange universals like mind, matter, subject, self, etc. None of these universals is primary or fundamental,
except in a practical sense.
The practical obscures, at times, the most profound aspects of our being. Just thoughts. Thanks. Here's a great site w/ views I can relate to and praise, generally speaking. And here's an interesting person I found on wordpress.
http://nonismo.wordpress.com