Advice on what to upgrade please - or new system?

[Pain]

So my current system is as follows:

"Krypton Baronyx" Intel Core i7 2600K 3.40Ghz @ 4.60Ghz Overclocked Bundle
8Gb Memory
MSI GeForce GTX 570 1280MB GDDR5 PCI-Express Graphics Card
OCZ Vertex 3 240GB 2.5" SATA-3 Solid State Hard Drive
Dell UltraSharp U2713HM 27" Widescreen LED Monitor
Corsair HX 620w

My budget is probably around £2000 and the PC will mainly be used for gaming (Battlefield / Anthem etc)
Any advice would be greatly appreciated.

Thanks.

 

[Pain]

PSU

looking for new case? if not whats your case ?
looks like monitor is 1440p IPS 60hz non sync screen
PSU is tier B (2018)/ Tier 2 so still a good one though guessing out of warranty?

Case is an Akasa Eclipse 62
Should I sell the monitor and get 2 new replacements (any advice on this)?
PSU is out of warranty now I think yes.

 

[Pain]

Thanks for your input guys will let you know which way I go, and the results!!