Hi Doomer,
since i work for DFI, my opinion is most likely biased. But I can tell you that I bought the KT400A before I ever thought about working for DFI, and it was the best board I had ever owned. Of course I own the NF2 and I875 boards. The NF2 is my main personal machine (I only have a 2.0Ghz Northwood 100FSB for the Intel heh), and I have had excellent results with it.
Anandtech gave it a very high rating in its review of the board, but if you are like me, you pay more attention to what users say that own the board for more than a few days to bench it. I'll merely add my opinion (already did =), and bump this so others that own the board can give you their opinions.
Travis