Help me Narrow down final choices

[cameron arch]

Hi everyone,

I am looking at getting a PC from OCUK, hopefully on black friday.

The PC will be used for gaming and some basic editin( family holidays etc), I'm a console gamer making my first step towards PC gaming so I don't need anything crazy!

Can someone please cast their eye over the following systems, I intend to upgrade the ram to 16gb and get a SSD. But im really looking for some expertise on which system is better bang for buck for someone like me , any advice on the graphics cards would be welcome aswell. Im a PS4 gamer mainly and have interest in some RTS. FPS and adventure games- would likely play the system online. Budget is max 800 but would like to spend less

System 1
https://www.overclockers.co.uk/ocuk-gaming-spectra-gaming-pc-intel-core-i5-9400f-fs-1d7-og.html

Sytem 2
https://www.overclockers.co.uk/ocuk...zen-5-2600-rx-590-8gb-graphics-fs-1aq-og.html

System 3
https://www.overclockers.co.uk/ocuk...2600-geforce-gtx-1660-6gb-fs-1df-og.html#t=b1

 

[cameron arch]

Just the tower mate, I have monitors and mouse etc already

 

[cameron arch]

My monitor is not g-sync , actually im going to be honest its just a basic entry level 24 inch Dell monitor.
I originally had plans for just having an office PC but i'm getting the itch now to get into PC gaming, is a lack of free sync or g sync a deal breaker for games? Is this going to be noticeable to me when playing?

Many thanks