Welcome to PureOC! We will be happy to offer some ideas into your future project.
First thing I can see is with a budget of 2000 and the dream of having 5-6 monitors are clashing. Even if you bought those monitors used it would eat over half your budget. Maybe scale back and start with 3 then upgrade as you go along.
I also dont think that GPU you selected will be worth a damn when it comes to running modern games. Even more so when talking about 5-6 monitors. It simple can not handle Titanfall, Watchdogs ect with the 2GB frame buffer and an aging GPU core. it would work for older games and autocad.
Newer GPUs are struggling with some of the games you listed so you need to plan carefully. If the GPU doesn't have at least 3GB of vram skip it. Look into the R9-280x models. 3gb with support up to 5 monitors without using any special adapter. I'm not directing you towards an Nvidia solution due to Nvidia not putting 3GB on most of their offerings. Go to Newegg and filter Nvida and 3GB and you will see what I mean. either the older 660 or a $500 780.
right now I would suggest an Intel Z97 based board with no less then an i5 quad cpu. 4760k is one of the more popular options. no less then 8GB of 2133. Some say 1866 but why not spend a few more $ and get something better. 240Gb SSD for a Boot drive and 2TB HDD for game space. 3TB if you can get it. 800-1000w PSU for future upgrades like dual GPUs. look into close loop CPU coolers (AIO)
The White Stryker is cheaper on Newegg. 134.99 (119 after MIR)