agree with gamercat's suggestion. You need a GTX 980m card on laptop for GTA V . The game is powerful and uses 3-4 gb vram. The games requirements are for desktop and not laptop and laptops are weaker than desktop. If the laptop with the 980m is out of your price range I would not go lower than a GTX 970m and make sure the video card has 4gb vram
here is a GTX 970 with enough vram for GTA V. You can customize his laptop further