If you are looking for excellent performance/max bandwidth + stability, but not interested so much in overclocking go for the A7M266.
If you want the above plus unmached overclokcking features go for the new EPOX AMD 760. It's a bit more risky though, because the EPox is brand new and only a few reviews and user feedbacks are available. But they are very positive. The A7M266 is already in 3 hardware revision now and totally matured.
The EPox is cheaper, and has 6 PCI slots.