Colby is correct, that 2.5" spinny drive stands out to me. I don't know that I agree with him on the alternative choice, but he is certainly correct on flagging that as something 'wrong'.
To expand:
2.5" yet you are putting this in a desktop type build. So absolutely no reason (outside of power usage) to go with a 2.5" drive. You sacrifice EVERYTHING by that, when the desktop form factor allows you to fully EXPLOIT things. Where Colby and I don't concur is the RPM, you can still get a 5400 rpm drive if you want, but there is absolutely no reason to put a 2.5" non SSD in a desktop form. Do yourself a favor and put the biggest spinny drive you can afford in there.
OR
Put whatever the largest m.2 drive in there you can afford rather than the 850. M.2 drives are really awesome right now, and since you aren't building on a mobo that doesn't have that option, there really isn't a reason to get an 850 IMO.
For some other of my personal opinion type stuff... and take this with a grain of salt, I've been out of the loop on a lot of these things for a while now.
I would question the need for 32 gigs of RAM. This is something that for sure will become the norm in the future, but do you need to spend money on it RIGHT NOW? Probably not - the mobo can take it, so you can always buy later if you think you need it.
That is a nice processor, but do you need to spend that much on a cooler for it? Depends on what you are going to do with it, which is also a question that leads into why do you want THAT processor? The stock coolers for the locked versions of newer intel processors aren't very big, things have gotten a lot more energy efficient over the last decades. We used to need huge heatsinks and exotic ways to cool to get great performance, and I suppose that is still true, but the difference between great and normal is a lot smaller now. So you might not need a K i7 without a cooler when you can get a k i5 that has one... or even just spend $30 on an aftermarket air cooled system. Spending over $100 on a watercooling system for a processor you might not push to the extreme could mean you can utilize that money elsewhere.