The cheapest 1080 will easily outperform the most expensive and highest overclocked 1070. If you are considering a purchase between the two, definitely get the 1080.
In my opinion, you really should only go with water cooling for the top tier GPU, such as the 1080ti because generally after you figure the cost of the additional cooling, the pricing is competitive with the higher tier card. This is why you do not see hybrid cooling on the 1060, 1050ti, or the Vega 56.
All the hybrid cooler will do is remove the thermal wall for overclocking, and sometimes have a lower noise level air cooled cards.