Thanks for the info so far.
Let's say that for the sake of being able to upgrade the video cards one day I wanted to get a mobo with only 2 x16 PCI-E 2.0 slots (that both use x16 pipeline) that have a bit of space between them. I could get the mobo with 3 video card PCI-E 2.0 slots (AKA http://www.newegg.com/Product/Product.aspx?Item=N82E16813157134)
but it costs more money. Hence I'm looking for a mobo with only 2 x16 capable PCI-E 2.0 video slots to avoid the cost but still want the full x16 pipelines for both cards.
What would you recommend?