I probably won't add another radiator. The CU1020V will dissipate around 800-900 watts of heat with the fans at 2000RPM; that's enough to manage at least one more 780 Ti, if not two. Right now the fans run at 1200RPM and the GPU stays under 45C even at 106% power.
The coolant is Koolance LIQ-702 in UV Yellow. I mounted 4 UV LEDs in the reservoir and it actually makes the coolant look neon green =P
Thanks! Other than the slight modification for the fan mounting holes, it was a breeze to work with. Both sides of the case are latched doors which can be removed easily for obstruction-free access when you're working on it. It was designed for 1 to 2 radiators, and obviously there's plenty of room for tubing; I had everything installed and running in about 4 hours.
It does have a couple downsides. If I need more 5.25" drive bays I'll be in a pinch since it only has 3, but it was just enough for the reservoir and BDP drive. And it's so large (27" tall!) I couldn't fit it under my desk, so I had to rearrange some furniture to accommodate it.
Thanks for the feedback guys =) As far as the RAM goes, I do use my PC's for Photoshop/Painter/ZBrush work. Most of my projects live on a NAS; the 512 SSD will be for OS and games. That said, I still probably went overboard on the RAM even if it's running in quad-channel.