My first video editing/gaming PC build - Help is appreciated

Hello guys,

So as the topic says I have decided to build my first PC and here are the components:

1. CPU Cooler - Noctua NH-D14
2. PC Case - Cooler Master HAF X
3. Hard Disk - WD Blue 1TB SATA-III 7200 RPM 64MB
4. SSD - Samsung 850 Pro 256GB SATA-III 2.5 inch
5. PSU - Corsair HXi Series HX850i
6. Graphics Card - GIGABYTE GeForce GTX 970 G1 GAMING 4GB DDR5 256-bit
7. RAM - HyperX Predator 32GB DDR4 2400MHz CL12 Quad Channel Kit
8. CPU - Intel Skylake, Core i7 6700K 4.0GHz box
9. Motherboard ASUS Z170 DELUXE

I have a few questions, you will have to excuse my lack of experience, I did some reading in the matter, however I am still a newbie:
1. Is the RAM I selected good for this configuration or should I opt for something from Corsair ? The mobo is capable of OC, should I also choose a higher bandwidth of let's say 3000 MHZ, would that impact performance considerable or just slightly ?
2. Is a 850 W power unit too much? would a 650W one cover the necessities ?
3. Which M.2 SSD would you recommend ?
4. Which website/s did you use to purchase your parts?

Thank you in advance!

 

Dump the following:
Noctua NH-D14 and sub in corsair h100 liquid cooling. no point in spending $80 and a massive chunk of metal when watercooling can be had from around $90-120
Ram go with g.skill, snag the fastest your motherboard with overclock will permit or price cap permits.
corsair psu - swap for Seasonic. Seasonic is the best power supplies you'll find. Since 2012, i've had a 520w bronze pushing my i7-3770k overclocked to 4.5ghz, 24gb of ram, 6 SSDs and 2 HDDs, 7950 gpu, liquid cooling, and some other items, while gaming and streaming 7 days a week. still my daily rig and never gets shut off. for your needs i would suggest just going 750-850 gold. even if you dont need it now, maybe you will down the road.
m.2 is a tad expensive for my taste, but if you really want it, just stick with samsung. quality/dependable.
the 970 is an ok card, however if you ever want to do 1440 or 4k, multiple monitors, i would highly recommend switching over to the msi r9 390 or 390x. wider bus/more vram = longevity.
the 390 also beats the 970 in real world gaming.
Most times i buy my gear from either newegg or amazon. More amazon since i have prime and i can save 1 day shipping.
another good place, if you have one around you, is micocenter. i got my i7-3770k for $105 less than the best sales on both amazon and newegg. the issue is you cant order it online (or i couldnt then) also got $20 off for buying the motherboard and cpu together. i think that's an everyday deal.