Please look at these parts

[whitelightning0528]

I'll be using it for gaming and maybe making YouTube videoshttp://pcpartpicker.com/p/jVysjX. Also should I use those cards in cross fire or get the single EVGA EVGA GTX980 Superclocked 4GB GDDR5

 

[Entomber]

if you get the single GTX 980, you'll have the option to upgrade to a 2-way SLI or more in the future, which gives you more headroom.

if you get the 2-way 290s, you'll get more performance now.