Evo 5 RS
Custom loops quickly get expensive, I wouldn't like to build a £2000 PC with a custom loop, Corsair solution is best and air cool the rest (spend the money on components).
I just spent 1,800 in watercooling. Add that to 3x 780Ti superclocks, a 4960X, 32GB 1866 Dominator Platinum and a Superflower 1200W PSU and you've got one hefty bill