Well, it depends, are you going to overclock and/or run SLI?
If you are, then I would wait, except for the DFI that is. If you're going SLI, I'd wait until its matured more (and prices and availability are more stable).
If you're not going to do either of those, I think that nearly any nForce4 board should be fine, they all seem pretty mature (factor that into the nforce3 Ultra boards as being beta testers pretty much).