I have looked at several blocks and I prefer the EK one to be honest even though its was more money than the others. With a backplate (compulsory and free with some other peoples waterblocks but EK charge extra) you are looking at nearly £200 from EK. But EK have gone with contacts to cool everything on the cards - gpu, vrms, memory, chokes etc. Some of the other manufacturers waterblocks dont cover all the things the EK one does.
And I have never ever had an issue with ek blocks for the years and years I have used them.
The ideal solution would be to wait for reviews and see which cools best but on paper I have my money on EK.
But I dont think they are shipping until mid to late October?