"best" is a matter of debate, but very few would argue that the EPoX 8K5A2+ is a very good overclocking board, and its certainly the board I'd go with if I were setting up an Athlon machine right now - however, if I were setting up an Athlon machine in a few weeks I'd get an nForce2 board, though we still don't know how well they overclock (should be great though, since they have independantly adjustable FSB/AGP/PCI speeds (read, "AMD FINALLY GETS PCI/AGP LOCK!").