Triple 144Hz 1080/1440p car racing simulation build help

What is your budget? $1600
Are you okay with mail in rebates? Yes
What is your usage (gaming, video editing, 3D rendering, etc.)? Gaming only; mainly iRacing only but will play other racing simulations (such as Project Cars, Dirt Rally, etc)
Do you have any interest in overclocking the CPU? No
When are you buying? Over the weekend of August 1st
What country are you buying in? US; There are three Microcenters within driving distance.
What peripherals do you currently have, if any (this includes mouse, keyboard, monitors/TVs, and headphones/speakers)? Yes; Mouse - Razer Naga; Keyboard - CM Storm Quickfire Rapid; Headset - SteelSeries Siberia v2
Do you require peripherals (mouse, keyboard, headphones, etc.)? None needed
If you require a keyboard, do you have any knowledge of switch types? Already own
If you require a mouse, what is your grip style? Already own
If you require headphones, what is your preferred form factor (over ear, on ear, or in ear)? Already own
Do you require a monitor? Buying either Freesync or G-Sync monitor depending on GPU selection
Do you require an operating system? Already own
Is wired internet a possibility? Wired
Do you have any components already in your possession which can be used in this build? Yes; Case - Ncase (mITX only); CPU - i5-4670k; Gaming HDD - Crucial MX100 512GB
Other?

1. Needs to be able to power 3 27" 144Hz monitors
2. This build will be watercooled
3. Must be on Mini ITX as that is all the case can hold
4. Would like to get the Samsung SM951 as my boot drive if possible in my budget as well