Intel i3 2100/2120 or AMD FX4100

I'm on a tight budget for under 600$ and the AMD is 20$ less. I don't know which would be better for me, I'm going to be playing games like minecraft, tf2, portal, left 4 dead, pretty much any steam game with a great sale and video rendering and encoding in After Effects and Premiere as well as web browsing and a bit of multitasking. I'm going to be using an HD 7770in the build. PLEASE HELP!