A couple issues with the advice given:
-For starters yes the 8600k is plenty for gaming, the 8700k will be very slightly better, emphasis on very, but for productivity work will actually be a large improvement.
-Board is fantastic, hard to find a better board out there for that price. Don't get BS'd into getting a cheaper MB, that board wins tons of awards every iteration for a very good reason.. it's one of the best there is.
-The NHD15 is the best air cooler there is, cools about 10C more than an H7, would be a very big help in overclocking as the 8600k runs hot as well. However, the NH-D15 has RAM clearance issues. I would recommend going with an AIO cooler, or going with an NH-U14S. Most AIO Coolers are very good and mostly perform very similarly. Do some research beforehand though. Not all are great or even good.
-It is debatable wether faster RAM or lower latency is better for gaming. The overall speed is extremely slightly different. In my experience at similar latencies faster speeds do help a little. With the RAM CAS being 10 it is not certain if it would be faster than say 3466MHz C16 RAM. It's up to you if you are willing to try it out. That RAM is not "cheap" by any stretch of the word. Last I checked that RAM was almost twice the cost of more or less stock speed RAM. Still a risk though, as it is not proven that lower latencies are better for gaming. Theoretically that RAM is EXTREMELY fast, though.
-Definitely ditch the 950 evo. If this were my rig I would go for the 960 Pro 256GB, an 850 Evo 1TB, and the 1TB WD drive. For starters the 850 Evo and Pro are very very close to the same performance so go for more capacity. The 960 Evo and Pro are not. I have a 960 Pro 1TB and for most of my games load times are non-existent, and for most they are very fast, but again for gaming there's not much of a difference. If you really want a M.2 I would just make it the boot drive and the 1 or 2 games you play absolutely the most and leave it pretty much at that (for load times). The warranties are also much much better on the Pro's. However at the end of the day only you can justify the cost.
-EVGA's are great and the FTW3 looks good. However it is pretty pricey, especially now. I would find what is at a reasonable price and go with that. I personally have a Zotac AMP! Extreme. It has one of the highest OC's of any 1080 Ti, it sucks a lot of juice but it cools very well, is very quiet, and imo is by far the best looking card on the market. 1080 Ti will run hot at 144Hz. Don't get a cheap heat sink, stick with something that is known to cool well or your thermals will be higher.
-A case is a case for the most part, Just make sure it has decent airflow or your CPU and GPU temps may rise. Corsair makes great stuff. Half my build is Corsair for that reason.
-I would go for a higher end PSU. No sense putting a mediocre PSU into a high-end rig. I really like Seasonic Prime PSU's they are great, highly efficient, dead silent, and look great. Pricey though. i would also stick with 650W. Only reason I have an 850W is because I wanted the option to do SLI if I wanted to.
-For the price of that monitor I would go for something like an Acer Predator or Asus ROG Swift.