Depends, if your wanting a top notch laptop 800 is a somewhat low price for most, Unless you plan to shop on Black Friday. Also depends what operating system you want ( Like Windows 10 or Windows 7 or whatever you feel more comfortable with if it matters to you at all).
Also the GPU is somewhat a big factor, Nvidia and AMD have pretty close to being equals (But I'll say Nvidia has in recent years gotten slight better than AMD, but I wouldn't say by a amount large enough where it really matters too much, but thier GPU is so somewhat comparable if you buy the newer versions that it really just kind of depends on what game you plan on playing, and the resolution. But Nvidia is a bit better, But same time AMD is a pretty affordable.
I'd probably try to customize your own, since in my experience I found better results in it, it may be more affordable and depending on what parts you get. Or wait till Black Friday and find the good deals around