Exactly as that article says, it is still a little uncertain regarding current 975 boards and Conroe. I would suggest holding off until things become more clear. I have heard however, that the Rev. C Asus boards are going to support Conroe, but you would want to confirm that.
985 boards, when they come out, should be the "high-end" boards for Conroe with support for the XE.
Also, as for the RAM, DDR2 667 is going to be its native support, so you would probably want to go with that, although DDR2 533 should work just fine as it would run 1:1 with the FSB.
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