I realize that the MSI board has a SB600 instead of the newer, fast 750, but it's also about 50 bucks cheaper (not counting any MIRs). I have also considered a 790GX board, but with the potential of me adding a second graphics card in Xfire I mostly ruled that out.
For your reference, the ram, cpu, and gpu I'm getting:
AMD Athlon 64 X2
Sapphire ATI HD4870 1GB
The M4A79 is definitely a nice board as well, although I'm a bit concerned about the placement of those three SATA ports if I crossfire (which is really the main reason to go with a FX board over a GX that I've seen).
Any reasons for choosing one board over the other? I'm open to peoples opinions on why to choose one over the other...