Which of the 3 computer should i get?

The 3rd one would be the fastest, with the 6-core processor. But they're all crap for gaming, because they don't feature any gaming cards. Anyways, for that price, you could build a faster computer than all 3. Or, consider this much better / faster one: a href="http://www.newegg.com/Product/Product.aspx?Item=N82E16883229237" rel="nofollow"http://www.newegg.com/Product/Product.as…/a