I would reccomend AGAINST the K7M board, I had to install one and they are a pain. Asus simply refuses to support it in any meaningfull way, you have to scrounge all over for drivers and bios updates. And really, in the end it's miniscule overclocking option is pathetic compared to what a golden fingers could give you on a K7 chip.
I have setup 3 other boards, I would reccomend the Biostar one, it was by far the most easy to do, or if you like fiddling the FIC one also was great.
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If your in range, so is the enemy.