I have the Asus A8N-SLI Premium which I am very happy with. It's very stable and I have the board for about a year and haven't had any problems with the it. It has good overclocking options and I got my Amd 4000+ to 2.8Ghz with no problem. So I recomend the board.
Currently, IMO, the best 939 board for uber overclocking, well endowed features and reasonable price is the Asus A8R32-MVP... and mate that up with a X1900XT along with some good DDR RAM plus decent 500+ watt power supply and you are at the top of the playing field.
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