Hardware Suggestions for PPPoE AC 3.0Ghz (again)

I am replacing our current MT with a newer beefer version. As changeip suggested it will either be a Supermicro 5014C-MF or a 5014C-MR. Just looking for some more comments on these boards and the compatibility with MT. Does MT support the onboard Broadcom BCM5721 Gigabit LAN Controllers? Also any suggestions on CPU would be appreciated.
I am just a little paranoid about getting a setup that unstable. Our current setup of AMD500 on an Asus board is so solid it’s scary. I’m just looking for a proven hardware setup with more horsepower.

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