Need help with my first build - 4k Gaming PC

Hey there and im glad someone wasted a bit of your time with me and helping me out. For real guys thank you in advance.

The PSU I totally believe for the price, amount of Watts provided and power efficiency given, that is worth but lets face it, if I will not use all of it, why would I "overkill" with power my pc computer for more money and more energy spent on the long run (electricity costs money too on the end of the month) and pay more money for it when with less money, same cost efficiency and less energy spent i get the same energy for the system with not being short in any way since 850w is more then enough? Just wondering...

CPU cooler + Case: I trully believe and please correct me if im wrong, with a OC CPU that I totally intend to do, the cooler that you suggested is known to be less effective as the one I picked, and kinda of blows my concept of airflow in the case that I picked for it (i know you suggested another one but I'll get there). I believe I can provide a great airflow on the 500r and with h100i with the right location of the fans and that cooler (noctua) will get the inside of the case bulky, on a system with already 2 GPUs... I can provide a clean environment inside the case for + 14 pounds (h100i) and with the - 13 pounds of the case I picked that fully supports the system I choose. I prefer to spare on the case and spend on the cooler that will be better for OC'd CPUs and have a better and clean environment inside the case to provide an optimal airflow. I lose 1 pound here but I see more benefit in it.

The motherboard I picked because I read that offers me better tools to control the overcloking procedures and the multi fans control too, thats the reason why I picked hero instead of ranger but if i get what I need for the OC and fan control that I'll set up then ill probably get the cheaper one.

The 16GB of ram is because I saw games like Watch Dogs consuming 4-6GB of ram and i dont want to get it overused when I be playing with 4k with some music running in the back ground + streaming + some work that ill be doing. I currently find myself using 85% when playing and having some apps running in background with 8gb on my laptop so thats why i want to play safe on this one. I picked the Corsair Vengeance ones cause they are red and go with the white+red theme of my custom build. If I go for the G.Skill ones they will be more expensive at 16GB so I think I'll stick with the Corsair ones unless they really suck =D

The storage I completely acknowledge that i didn't look much into and went for the "basic thing" but you offered me a cheaper and apparently better solution and I will follow you on that one with pleasure =D

On the GPU I chose the 970 SLI cause of the cost efficiency presented on the reviews that i read saying that can handle the most recent games in 4k and ultra settings (above 60fps with watch dogs needing to lower the AA on that to be above 50fps). That said, im more then happy to spare 400 pounds on GPU cards and have a great monitor (not big of a choice if we look for one with 4k res and working at 60 mHz) and have less energy consumption. The Cards are almost 50% less the ones you adviced (around 275 for 480 pounds), perform 12% less then the 980 SLI (i assume if i OC them it will be even less) and they consume less energy too so I dont know if the 980 ones are worth the 400 pounds difference that I can use on monitor.

The last concern come to the CPU. CPU I picked the i7 cause of the reviews about great gaming performance, better for 4k gaming and prone for OC with ease and in my head I compare to i5 with stock of 3.5 and i7 with stock of 4.0 and I go for the expensive one and believing that in a couple of years I dont need to worry about CPU but if u tell me that i can have that i5 running at 4.5 with the same ease of OC (like 1.25vcore for example) and that will be has future proof as the i7 is and in that time will perfectly handle my 4k gaming in the next years then i will obviously pick the cheaper choice.

Once more, i have everything thought in my head but if you tell me why i be better served with other stuff i will happily change my set up, specially if I get more money in my wallet in the end =D

Great answers i got here and they oppened my eyes for some things...

I apreciate all the feedback you guys gave me. The answer from zeyuanfu was the closest to my needs and i found myself getting what I need with less =)

Ill do a background check on every single price on stores but that will definitely be the things ill chase for.

Rapajez thank you for you inside note with noctua. Still seems bulky, but better than i was expected to be honestly xD