OK. I can't tell you anything about water cooling because my knowledge on that subject is very limited. I can help you with the rest though:
CPU : Core i7 4960X
Get an i7 4930K instead if you want to save money. The only difference between these two CPUs is that the 4960X has slightly faster clock speed. If you are going for water cooling you will want to overclock it and then the difference will be negligible. A good 4930K might even overclock better than a bad 4960X (There is no way to tell in advance how well a particular CPU of one type will overclock compared to another one of the same type )
Rampage IV Extreme Black
Is that socket 2011? I couldn't find that model where I looked. Either way, you don't need to pay $500 for a MB. Good MB start at maybe $130. Since you want to go SLI and have a big budget you can pay much more. Maybe $300 or something along those lines. If you want to save money, $500 is definitely not necessary. I can't recommend any alternative to you, as I don't know anything about Socket 2011 boards.
HDD : 2*WD Caviar Black 1TB
The black series is usually very expensive compared to the green series. It is also faster, but if you have a 1TB SSD, you will probably do your video editing and gaming on that SSD. So you could probably get double the storage for the same price if you go green and just use the SSD for all things that require speed. If you believe you will actually need the speed, then go ahead though.
RAM : 2*Corsair Dominator Platinum 2400MHz CL9 (4*4GB)(CMD16GX3M4A2400C9)
This is very good RAM, but 2400 MHZ isn't really necessary. Bandwidth isn't really a problem today with RAM. Consoles only have one type of RAM, that's why it was an issue with the Xbox One. PCs have DDR3 RAM and GDDR5 VRAM, which has plenty of bandwidth. It is hard to tell what the future will hold, but if the 2400 MHZ RAM is too expensive you can go down to 2133 MHZ easily.
Monitor:
I can't tell you what specific monitor to get because that would require a lot of research for which I don't have time. If you are spending thousands of dollars for your PC, I would get a really good monitor as well. Maybe get a decent 1440p monitor for gaming?
OK, that's it. I hope I could help.