EVGA GTX1080Ti K|NGP|N Hydro Copper is Pascal I would like to have most.
She is not only incredible, it's single slot card... That would be amazing if some of motherboard vendors decide to launch DTX or Mini ITX Motherboard with slot for dedicate sound card or to build external radiator for watercooling not in small Mini ITX Case. Because Mini ITX Case have two PCI-E bracket very often.
I would use GTX1080Ti K|NGP|N Hydrocoper with this on Lian Li PC-Q37 and MO-RA3 Stainless steel under table.
Too bad because watercooled cards are not single slot... To be honest I would payed 100-150 euro and give GTX1080Ti Poseidon for GTX1080Ti K|NGP|N Hydro Copper, card and blocks are amazing. Single Slot Watercooled GPU are important.
Best chance to find GTX1080Ti K|NGP|N Hydro Copper is to look very often Market Place here on Community and Ebay constantly.
But you will need a lot of luck to find only block. Someone will maybe accept to sell only block.
Because I saw price of used GTX1080Ti K|NGP|N was much higher then other GTX1080Ti, Hydro Copper is even more expensive.