Why isn't evga or leadtek on that list........ahh wait...australia huh....I think I remember a few aussies saying evga wasn't predominate down there.
Out of that group I'd pick BFG......who knows how long you'll last, that's an impossible question...talk to the people who make the games...have you seen the latest video for the next far cry crytek engine? It looks ridiculous in terms of graphics and physics
Presuambly you planning on building a PCI-E system? AGP is fast becoming obsolete. Are you planning on buying a second (PCI-E) 6800 GT in the near future? If so, then you want a good quality nForce4 SLI mobo. On the flip side, btw, if you want to upgrade to dual ATI (Crossfire) cards when they are in full circulation, then you'll have to wait until the Crossfire-ready mobos are released.