My current 7yo desktop computer is slowly getting too old for my personnal use: it cannot run the latest mods and the biggest maps without lags, and the most modern engines don't run anymore... (Besides, the HDD is 99% full so I need at least 2To more)
I am considering buying a new one within the next weeks ; with good specs so I won't have to worry about lauching the most demanding mods, or even some modern games without lags.
I guess Doom 4 or GTA5 ran smoothly is fine enough for me... ? I don't know any of the nowadays games with stunning graphics, but basically I want to be able to play most of them (eerm not necessarily the very latest ones of course, I have no money for that...).
My question is: What specs are good enough for the use I want ? (GZDoom mods is what I play(ed) the most, but I also want to try games I can't run actually with my actual pc)
I have to confess I am really confused about hardware stuff and the good/bad companies.
- Should I buy a branded computer or build it myself? (ratio price/quality?)
- Intel? AMD? NVIDIA? What do you recommend and what do you not?
- Win10 or 7? (currently on 7 and like it, but is it not getting old now?)
- I also consider buying a new HD screen : which company to avoid? Which one do you recommend?
- Also, LED/OLED/LCD/whatever... I have no clue about what is what: any advice?
I'm not asking you guys to do my part of the work, I simply would like some advices to not being rip off and to get less confused when the time to choose comes.
Anyway, thank you for any of your help! Cheers!

P.S: I live in western Europe, and I've a budget of, say, 1500€ maximum? (screen included...), but if I can put lower price that would be muuuch better.