Hello Motex64,
I would suggest looking at our Cooler Master Eisberg 240L or the Cooler Master Glacer 240L for you HAF-X case. Both of these coolers are able to be modded to add different color tubing, extra radiators, and GPU water blocks.
You will also be mod the Eisberg/Glacer to cool the VRM's on your ASUS Maximus Formula VI since it comes with a water block pre-installed.