While there are tons of cameras on the market, understanding your specific needs is fundamental to narrowing down your choice of setup.
But simply put, you need a camera that can do 4K, at least 60FPS at 4K & 120FPS at 1080p, it should be good for low light, a lens with at least an achievable 2.8/f (aperture), smooth autofocus, and preferably Full Frame.
What Do We Suggest?
High End - Sony FX3 or FX6
Middle Range - Sony A7R V or BlackMagic Pocket Cinema 6K
Low End - Sony a6600 or Sony ZV-E10