Call of Duty is a game designed to run at 60FPS on consoles, and the visuals arent that much better on PC. You would struggle to make a rig that couldn't dominate COD IMO.
Also the rig is way overkill if COD is the most demanding application it will run (or gaming in general). You can spend far less and have the same performance.
Also, unless you know what your doing, do not get into Custom water-cooling. If you arent comfortable building a computer yourself, you will definitely be way out of your league if something in that loop fails.