If you are looking to play demanding games, such as Grand Theft Auto V, the Witcher 3, or Fallout 4, you will not find such laptop at that price point. You would need a laptop that is practically similar to a desktop in specs - a GTX 980 (Mobile), and GTX 980M; you could possibly get away with a GTX 970M however.
If you are looking to play other games that isn't as demanding, such as Counter-Strike: Global Offensive, you could get away with a GT 940M, but I would rather get an GTX 950M if on a tight budget; I would go with a GTX 960M if not on a tight budget.
Acer Nitro (GTX 950M): $699
http/www.newegg.com/Product/Product.aspx?Item=N82E16834315165
Acer (GT 940M): $499
http
/www.amazon.com/Acer-E5-573G-15-6-Inch-GeForce-Windows/dp/B012IBOCRU/ref=sr_1_1?ie=UTF8&qid=1452556734&sr=8-1&keywords=GT+940M