Needing best computer

depends what game specifically you want to play. how new is the AAA game? what kind of monitor will you be playing it on? it sounds like you dont know a lot about PCs so i would STRONGLY advise you to learn more about graphics cards, cpus, motherboards, ram, storage, power supplies, and monitors before you spend a ton of money on anything. youtube videos are very helpful from linus tech tips or gamersnexus