Another vote for the Epox 8K7A. It has the AMD 761 chipset, which is a better performer than either the ALi MAGiK1 or the KT266. The KT266 chipset may improve over time, but if you want a good DDR board now, go for one with the AMD 761. That includes both the Epox 8K7A and the Gigabyte 7DXR.
Good luck!
Nick