donstavros :
http://pcpartpicker.com/p/ZsHzbv
I would suggest you to wait couple of months more and get the new architecture but its on you
What new architecture? As far as CPUs go? There's AMD Zen but whether or not that's a viable alternative to Intel remains to be seen. There's also Broadwell-E but in Europe that's a lot more expensive than it will be here in the states. Graphics? You're going to be waiting for Polaris (AMD) and Pascal (NVIDIA). If you're going to buy now, buy now. If you're going to wait, wait. If you buy with the intention of upgrading you will never be satisfied with anything you have.
From what I've heard, 27" at 1080p works great for gaming. And it makes the icons bigger in windows and easier to see. Pros sometime complain about pixelation at that size, but people in the forums deny this. 1440p is nice for extra real estate in games, but damn it takes so much horsepower to run it. I don't think the technology is there yet unless you have serious cash for 980Ti's.
Seriously? You can get pretty decent frame rates on 1440P with a 960 or R9-380X. You might be getting things confused with 4K which does take a lot more horsepower to run.
Frig cable TV is still only 720 and 1080p. The odd 4k on netflix is about it. Try rendering that in real time with games...it's crazy. I'd rather go 144Hz GSync 1080p 24 or 27". Wait for pascal and future AMD stuff to release, prices to stabililze, and in a year or so 1440p will be more worth it. 1440p monitors are also crazy expensive with the 144Hz and GSync. You can buy a 50" 4k TV for your living room cheaper. It's nuts. If you have the cash by all means go for it.
No way, those monitors cost around $1K here in the states. I shudder to think what they're going for in Europe.
OP - what country are you from? Knowing that will help to suggest a system.