Small form factor gaming pc

[Lifter-X79]

In the past I've never seen the need for a small form factor gaming pc. I personally have a 750D and love it, especially as long as I don't have to move it anywhere. I would like to spend as little as I can without taking a major performance hit (med-high settings ~60 fps) . I don't play a lot of games that are super difficult to run, mostly DayZ(nothing can run this decently), Arma 3, and Payday 2. I'm open to all suggestions because I don't know much about this kind of hardware (APU, ITX, and whatnot). 

 

EDIT: Budget is $500-$700 USD @Cacao and @Prodigydeadeye

[Cacao]

Well how much do you want to spend exactly? You need to give us some sort of budget, otherwise we'll just be putting together useless parts lists for you.

[Prodigydeadeye]

Well how much do you want to spend exactly? You need to give us some sort of budget, otherwise we'll just be putting together useless parts lists for you.

have a like.

[Lifter-X79]

Budget is $500-$700 USD.

@Cacao and @Prodigydeadeye