Gaming desktop help

[H20___]

I want to buy, and or build a pc used primarily for gaming at the price of $600-700. I am not tech savvy at all, hence my presence here.
I know absolutely nothing about PC's.
Basically I'm asking one of you kind people to build one for me.
Maxium performance at this price range.
I want to be able to play games such as GTA5, battlefield, fallout 4, all the new type games.
Help?

 

[TDHBP_Messed]

There are many gaming desktops and laptops in the range between 600-700 such as Lenovo Z50 laptop and Dell XPS x8900-944BLK Desktop also there are HP PCs such as the envy 750z! Actually if you want a good PC the envy 750z is great but it's price is higher than 700 but can be customized from the website here: http://store.hp.com/us/en/ConfigureView?catalogId=10051&urlLangId=&langId=-1&storeId=10151&catEntryId=1004653&quantity=1