Should be a fun build.
I just transferred my rig from a Phanteks Luxe Tempered Glass into a Phanteks Luxe 2 (Enthoo 719) about 10 days ago. Was a little disappoint with the top radiator support - I have a 420mm in the front, a 240mm in the bottom and a 240mm in the top. Reviews have noted that the bottom rad width is a bit tight (i.e. an EK SE 240 @120mm wide will fit but the EK PE 240 @130mm wide won't) but nothing was mentioned about the top radiator support. I had to dremel a few of the locating lugs off the top panel to get it to fit as the rad protruded about 4mm past the locating holes in the top of the chassis. Looking online, it appears that most other radiator brands (Corsair/Hardware Labs/etc.) are around the 120mm range in width, it looks like it's just EK's PE & XE series that are too wide.
One other point to note is if you want to use the mechanical drive cages in the bottom of the case with a 240mm radiator (which you can't do if you are building a dual system), it'll fit but it's a tight squeeze to get 'em cabled up with the bottom radiator butting up rather close to the drive cage area.