Which of these gaming PCs should I get?

I have these two gaming PCs that I found and I need to know which one would be best for me to use. All I want is a gaming PC that will be pretty fast so I can play games like PlanetSide 2, WoW, Minecraft, or any of the Batman Arkham games with no lag. Taking into account specs and prices, which of these should I get and why? I'm barely knowledgeable on computer specs or parts. Also, is there a PC under $600 out there that would be better than these two?

http://www.newegg.com/...6883230097

http://www.newegg.com/...6883227510

I see the second one is sold out but i would see if you could order one of those for the same price and if not you should look around and unless you want to buy it new have you thought about buying a refurbished one