I only play League of Legends, Smite and Warframe on my current PC (Dell XPS 720: old as dirt). I already ordered a video card because the one in my Dell took a crap on me a couple days ago. I'm sticking a 650 Ti in it for now, so that's the card I'll be using for this build. I was thinking about throwing a couple fans on the case for added air flow along with an aftermarket CPU cooler.
I already have a monitor, keyboard and mouse, so no need to add those.