If you plan to OC, and you have enough sense not to tweak anything in the BIOS which you do not fully understand, go with DFI. Otherwise, Asus would be a good choice.
MSI was a f***ing awesome company for Socket-A boards, but I have had mixed feelings about all of their Socket-939 boards that I have used. I have personally built at least a dozen computers with them, and I have stability and/or compatibility problems with at least 1/4 of them. On the bright side, their RMA policy is easy to deal with.
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