Is the Dell XPS 8700 $749.99 a good gaming build?

The key is the video card and what you consider good gaming build. The GTX 660 video card included with the main build is solid enough for most games currently out there. It may not necessarily run BF4 at Ultra settings but it wouldn't matter if all you play is Minecraft.

I'd take a look at 3XS Scan gaming laptops or chillblast laptops. They are best for gaming and price.