Good Build ?

[pedropinajesus]

https://pcpartpicker.com/list/Bq9yq4 «This is the build

I'm also unsure about buying a 144Hz monitor or a ultra wide monitor.

 

[kanewolf]

A 120GB SSD is too small. You will end up working too hard to avoid filling it up, IMO.

A GTX1080 may be overkill, depending on what resolution that 144Hz is. Get a 1070 and a 500GB SSD IMO.

 

[WildCard999]

I changed a few parts to allow you to get a bigger SSD, more RAM and a better CPU.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 2600X 3.6GHz 6-Core Processor ($223.29 @ SuperBiiz)
Motherboard: ASRock - B450 GAMING-ITX/AC Mini ITX AM4 Motherboard ($131.98 @ Newegg)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($160.98 @ Newegg Business)
Storage: Crucial - MX500 250GB M.2-2280 Solid State Drive ($67.72 @ OutletPC)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($57.89 @ OutletPC)
Video Card: MSI - GeForce GTX 1070 Ti 8GB ARMOR Video Card ($434.99 @ Newegg)
Case: Phanteks - ENTHOO EVOLV SHIFT Mini ITX Tower Case ($117.98 @ Newegg)
Power Supply: Corsair - SF 600W 80+ Gold Certified Fully-Modular SFX Power Supply ($114.89 @ OutletPC)
Keyboard: Redragon - K550 RGB YAMA Wired Gaming Keyboard ($68.99 @ Amazon)
Mouse: Logitech - G502 Proteus Spectrum Wired Optical Mouse ($49.99 @ Amazon)
Headphones: Audio-Technica - ATH-M30x Headphones ($59.00 @ Amazon)
Total: $1487.70
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-08-01 15:25 EDT-0400

If your budget is around $250 for a monitor I'd recommend this LG ultrawide.

PCPartPicker part list / Price breakdown by merchant

Monitor: LG - 29UM60-P 29.0" 2560x1080 75Hz Monitor ($252.34 @ Amazon)
Total: $252.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-08-01 15:23 EDT-0400

Edit, accidentally posted original build.