ASUS F1A75-V PRO
It seems that ASUS manages to make it's way on to my best-of lists almost by default with a PRO series board, and that should be considered a testament to the company's consistant execution. The ASUS F1A75-V PRO is just the latest in a long line of motherboards to earn top honors.
Expansion support on this full ATX board includes up to 64GB of RAM across 4 DIMM slots, two PCI Express 2.0 x16 slots, two PCI Express 1x slots and 3 PCI Slots. This is about on par with the competition, but the support for 64GB of RAM is extraordinary (though I have a hard time imaging why anyone would need it).
The port selection is equally impressive and includes seven SATA 6 Gbps ports, four USB 3.0 ports, two USB 2.0 ports, eSATA 6 Gbps, HDMI, DVI and DisplayPort. Whoo! That's quite the selection, and it really helps the motherboard stand out. The only thing missing that would be nice - particularly such a well built motherboard - is FireWire.
ASUS also includes some nice extras beyond Gigabit Ethernet and Realtek audio. The UEFI BIOS, for example, is the best currently in the industry. ASUS also leads the competiton in support for fan speed controls, which means you can customize your fans to spin at certain speeds based on certain conditions.
The only downside? Price. At $129.99, this PRO series board is pushing it for a Llano motherboard. Still, if you want the best for your AMD system, this is an excellent choice.