if you plan on ever adding a second card then you have to run with nVidia chipsets like the 750a
but even if people buy with the idea of adding a second card most people never do .
If your processor is compatible with an AM2+ motherboard then with either a 780 , 0r 790 series chipset mb is probably the best all round choice even though neither will let you add a second nVidia gfx card.
Of course if your current mb is working well you might as well save the money