AOpen: Looks cool, decent feartures, but not a good value because of high price.
ABit: It has RAID, and a solid set of features.
FIC: A bit less featurewise. Does not look cool at all.
MSI: Decent board, excellent features, great value. Has all the features of the AOpen and ABit KT7 (no raid though) but at a lower cost. Also the most stable board.
DFI: Er.... I have no idea.
I'd go with the MSI, although I'm also tempted to try the AOpen. Both are quality boards. The MSI is the better value though, and the board of choice.