I doubt a 415 mm long rad eats up an optical bay in a case so big. then again, lot's of wasted bulk on the 780T and the top mounting holes are fixed, not slotted. go for the Enthoo Luxe. EK rep and someone in the owners thread said it fit inside the pro, but was kind of tight. you can position the rad further away from the optical bays in the phanteks cases and thanks to the placement of the I/O behind a false optical bay (and having 3 optical bays) this thing eating up an optical bay is a non issue. I have a 60 mm thick 360 rad in my Luxe and it's got plenty of room around it and only comes 1/3 tha way into the first optical bay.

edit: you were asking about the predator 240 before. it isn't gonna interfere with optical bays in any of these cases.