I would look into the MSI 790FX-70GD motherboard. It's not so gamer-inclined as the Crosshair III is, but it does have a lot of features and in terms of raw FPS on games, the 70GD beats the Crosshair III by several FPS. It's much cheaper as well.
Both are good motherboards though and they are currently the top AM3 boards right now, unless you want to count the Asus M4A79T Deluxe, which is the next best thing after the Crosshair III.
I actually considered the GD70 before I saw the Crosshair III.
I a not be able to get either though since they are so expensive and I'm on a $1000 budget.