HoMM 1-3 surely were the best of the series. It seems they sort of return to the virtues of the past with graphics of the present. Looks good so far.
3, 2, 4, 1, 5 in my opinion, but that doesn't mean 1 and 5 are bad; it just means the others are even better. The whole series is fantastic as far as I'm concerned.
And yes, I'll be getting 6 as well, no doubt about it.