Not sure why everyone here is obsessed with the DFI...(in other threads at least)
They've never even explained what makes it a good overclocking board.
My opinion is the MSI, for a number of reasons. On Tom's Hardware they did a comparison (extremely detailed and well done comparison) of the DFI, MSI, Abit fatal1ty and many other 939 PCI-E boards. The MSI and Abit took the lead. Since price was not a very big consideration in that test Abit was able to rank with the MSI. (the Abit is a really overpriced board)
You can look at all of the various benchmarks they did, and read the conclusion, they clearly show that the MSI is better. And Tom's Hardware is probably one of, if not the, most reliable benchmarking/hardware guide website around.
And....that's my opinion: Get the MSI.
EDIT: lol, forgot to put the link to Tom's Hardware board comparison....click here!