Needless to say, a full, high quality water cooling system will undoubtedly run you a few hundred dollars. The average high-end PC owner either isn't ready to drop that much more money over an air cooler or doesn't need to cool anything except their CPU. And even among those who do have the dough and the desire, it takes a special person to take that leap of faith to a custom water kit, with so much room for mistake and ruining your beloved computer.