I really want to "upgrade" my D300. I like the idea of the 5100 articulating LCD. But I appreciate the better build quality of the D7000 and two card slots. It is interesting that you say that the 7000 is much faster than the D300. I find the D300 to be no slouch for AF speed. Its really almost as good as my D3 in this regard. So can anyone say how the D5100 compares to the D300?