Just checking you did not want a bunch of HDDs and ODDs because they occupy valuable space. You don't need a liquid cooler, and certainly not one that 'big' to cool that system, even if you overclock to the max. Skylake seems to run out of voltage before it runs out of thermal headroom, so overclocking runs cooler than Haswell. A 240mm radiator would be plenty, and so would 'big air' where you have 190mm of clearance for nearly anything.