Crucial by far is making the best and most overclockable DDR right now. It is so cheap that I bought another 128 mb this week($26!).
I run my system at 168 front side bus and it is very stable. I have gotten it up to 175, but not 100% stable. I know several people at AMDZone forum who run the A7M266 with Crucial at similar FSB speeds.
Badly, the Epox DDR board is supposed to be excellent as well, much cheaper too. If you want some good info. on AMD DDR boards, go over to
www.amdzone.com and check out the AMD chipset forum. Good luck.