What watercooling parts should i get

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($339.99 @ Newegg)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($144.99 @ Newegg)
Memory: G.Skill Sniper Series 16GB (2 x 8GB) DDR3-2133 Memory ($167.99 @ Newegg)
Storage: Crucial M500 240GB 2.5" Solid State Drive ($109.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($51.99 @ NCIX US)
Video Card: Asus GeForce GTX 780 Ti 3GB DirectCU II Video Card ($638.00 @ Newegg)
Case: NZXT Phantom (Black) ATX Full Tower Case ($119.99 @ Amazon)
Power Supply: XFX 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($119.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($15.63 @ NCIX US)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($92.98 @ OutletPC)
Wireless Network Adapter: Asus PCE-N10 802.11b/g/n PCI-Express x1 Wi-Fi Adapter ($11.99 @ Newegg)
Keyboard: Razer DeathStalker Ultimate Wired Gaming Keyboard w/Touchpad ($238.99 @ Amazon)
Mouse: Razer Ouroboros Wireless Laser Mouse ($125.75 @ NCIX US)
Total: $2153.27
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-08-11 05:23 EDT-0400
 
I would make these changes if it were my money being spent, first of all you do not need 16G of system memory because a large amount of it won't even be used at all, the modules linked below are 8G 2 x 4G kit Trident and are 2400mhz and using XMP profile in the BIOS will automatically set them to run for you at 2400mhz, which will be Killer for gaming.

I was running 32G then dropped to 16G and I'm now down to 8G and even the 8G is not even half being used while gaming, use Task Manager and see for yourself.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231587

Since you're not overclocking I recommend this motherboard simply because you may want to do a little auto overclocking later, and you can, with this motherboard, that is completely up to you.

http://www.newegg.com/Product/Produ...3132118&cm_re=ASUS_Z97-_-13-132-118-_-Product