I've never given the subject much thought; to the extent I have, I tend towards Searle's emergence theory. That is, the mind 'emerges' from certain combinations of matter kind of like wetness emerges from a conglomeration of water molecules (one water molecule isn't wet). So I'm sort of a property dualist, I guess.
The difficulty with purely non-dualistic theories is that none of them so far really work. It's hard to see how mere electrical impulses and the like can provide us with the sort of mental life we have, with thoughts and sensations and judgments. It goes against some of our basic intuitions to say that there's no difference between the mental and the physical. It just seems clear that a thought is not a physical object. But, of course, dualistic theories, especially substance dualism, have their own flaws, as Unga pointed out.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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