Personally,
I recently got the Abit AN8 motherboard with an AMD 939 pin 3700+ San Diego processor. I have always had good experiences with Abit. The AN8 is no exception.
Also, if you ever think about overclocking an AMD processor, the AN8 has some nice features from inside Windows including flashing a new bios. The AN8 also supports future processors and 4400 speed ram. I bought mine from newegg.
Regards,
Malta