Ghostchanter

I would argue the Harmon target isn't even the best sound signature for gaming.a flatter sound signature with detailed highs for competitive or something more v shaped is ideal for if you want nice explosions and gunshots while still wanting to hear footsteps is ideal.

There are a ton of headsets that are quite nice and sound pretty good. PC37X for example. But honestly if your buying a headset, especially for gaming, I would probably be looking more for comfort and convenience instead of scrutinizing over which fits the Harmon target response curve the best, especially since I doubt anyone has complained about the vocals being muddy while playing CS. The virtrusos or a Arctis 7 are definitely a good choice but I would go for the PC37x if you want better sound quality while your listening to music.

There are a few good options, and loads of crap. My friends Sennhesier G4ME headset is quite nice. The mic is significantly better than any Hyper X he had before it.
I'd also check out Hardware Canucks channel. They seem to do extensive reviews on headsets, and have loads of comparisons.

The 2070 Super would be a great option for you. They're great for 1080p and can even kill it with 1440p with pretty much 2080 performance for cheaper.

well, since you can't see the future, it is best to plan for the present.
 
it is overkill, but you did mention 1440p and you could also aim for 144 fps. Also, Cyberpunk 2077 has really demanding system requirements, a beefy graphics card is recommended.

That CPU is solid still, so the best graphics card you can get for your money is the best move. For your £600 budget, that's a 2080. 
https://uk.pcpartpicker.com/product/QsBTwP/msi-geforce-rtx-2080-8gb-duke-video-card-rtx-2080-duke-8g-oc

I think scan were well within their rights and did everything they could to resolve the issue. From building many computers you just sometimes get to those odd situations where stuff just....it just wont for no valid reason, talk with the other components - it seems not all PC parts get along 100% of the time. They have some pretty serious testing they do on RMA components and check many many things - but replicate your EXACT rig and situations is something no company can ever ever ever do. Another thing I have never ever see a company do is replace something that within their own professional opinion is not broken - why would they? If the issue is most likely YOUR parts then sadly it is YOUR problem - the fact that another similar board works still does not prove the issue was still not your own parts.
 
Overall this person would have tested anyone's patience and the very fact you were conducting a full blown RMA discussion over facebook just baffles me. Let's say you take them to a petty court over your wasted cash for the "broken" motherboard or complain to trading standards. While I am sure they would do their best to assist with the matter, deep down inside they would instantly just giggle with a facebook argument over RMA as it borders into the realms of complete lack of credibility on anyone's part...because its facebook lol.
 
Pro tip - serious matters concerning what you consider serious issues should always be done in ink or via e-mail - possibly even a telephone call. Keep the trail clear and deal with them EXACTLY as you expect them to treat you. Telling them to f'off or anything usually in any company results in them just refusing to do business of any kind with you, as no staff member gets paid to take abuse to the level you dished out over that facebook page - you dodged the bullet this time and I actually commend scan for continuing to communicate at all.