Hey mate. You wanna play gta IV or gta V ? For answering at your question: If you want something bugged, you can get something at 200$, if you want to be a "pro" with many modes, with graphics modes etc, you maybe can get one at 1000$+. But..
For example i bought a potato laptop just for this mode, for fun, and i get this laptop at just 150£ ! Yep !
I run all on low with 60FPS, specs:
Intel Core i7-2760QM CPU @ 2.40GHZ , 2401 MHZ, 4 cores.
8 GB RAM
32 VRAM Memory (Meh)
Oh, i run Windows 10 PRO too, so it is good i think. Laptop Name: Dell Latitude E6420 / x64 based. Bye