Gaming PC for a coworker

I am helping a coworker get back into PC gaming. He has an old PC currently but becuase he just moved it is packed away but he wants to try and reuse anything he has. Additionally, he wants 1 1440p144hz monitor but also wants two more for extra work space, so the extra dont need to be 1440p144hz.

[$3000]My budget

Date I will buy: ASAP

[X]before []after tax - rate:

[X]OK with rebates - I know I will pay more upfront

Country: US

Not US/CAN/EU/AUS? Provide websites to shop:

[]Microcenter/[]Frys store access

USAGE

List programs and indicate distribution with percentages: xx%

[X]Gaming: 80% Overwatch

[]Gameplay streaming to Twitch, YouTube

[x]Photo/Video editing: 20% nothing in particular

[]Music/Audio production:

[]CAD, CFD/FEA, Engineering Simulations:

[]Server:

[]NAS/Web surfing:

Percent time spent in each role:

SCREENS
Select ONE
[]1080p60Hz
[]1080p144Hz
[]1440p60Hz
[x]1440p144Hz
[]5760x1080-Triple Wide
[]4K 60Hz
[]I own []don't own this

OVERCLOCKING

[]I am willing to overclock my CPU

Can be very helpful for high refresh rate monitors (144Hz)

Many workstation programs benefit from it

ENVIRONMENT

[]Hot []Dusty/Pets []On 24/7 []Low noise [x]Normal

PERIPHERALS

I have:

[x]Mouse:

[x]Keyboard:

[x]Headphones/speakers:

I need:

[]Mouse: []flawless sensor, grip: []palm []fingertip []claw
[]Keyboard: []mechanical []quiet []tenkeyless []backlighting
[]Headphones/speakers: []over ear []on ear []in ear []Isolation required

OPERATING SYSTEM

I need Windows[x], version: 10

[]I have access to DreamSpark or a similar for cheaper/free OS

INTERNET

[]I can connect to this computer with [x] a cable or [] a Powerline adapter

[]I need wireless

CURRENT PARTS

Please list any parts you own we could use, exact part numbers (especially for PSU's) or pcpartpicker.com links are most appreciated: He has PC case thermaltake Vc3000bws, 650 watt power supply (I have asked for specifics but currently the part is packed away, please suggest a power supply just in case), 1 TB HDD but want an SSD for OS and games and case fans.