Need help with my build, and if I should make changes!

what is that build intended for?

How do you feel about overclocking? if you are fine with that go with ryzen 7 1700 and simply overclock they are same chip just clocked differently by amd

i'd strongly recommend not using B350 MB for 8 core ryzen
they ALL have mediocre VRM that is able to run those CPUs at stock, but if you try to overclock - it will overheat. the consequences are between shutdown to nice fireplace.
get X370

I'm not a fan of MSI, IMHO Asus first, then Gygabite, then no go for the rest. but that's me
this specific one seems to be sufficient.

Both Prime X370-PRO and CROSSHAIR VI HERO will do the job.
the second is kinda expensive at 250$.
First one is really nice

Both Prime X370-PRO and CROSSHAIR VI HERO will do the job.
the second is kinda expensive at 250$.
First one is really nice

Both Prime X370-PRO and CROSSHAIR VI HERO will do the job.
the second is kinda expensive at 250$.
First one is really nice

the beast says "thank you"
I'll make it long:
1. the PSU is fine. I'd personally go with either Corsair's RM650x or EVGA SuperNova G3 650w (whichever cheaper) simply because they are excellent PSUs with 10 years of warranty. The 650w is simply to have the PSU fan almost always at 0 RPM.
2. if you don't overclock, the B350 is fine. BUT - if you trying to build a gaming rig, even i5 is doing better. not to mention that for the price of your CPU and decent MB, you can get a 7700K + very nice Z270 MB. The ryzen thing is good for workstations with heavily multi-threaded load. It is mediocre when it comes to gaming. If you overclock, it becomes decent for gaming. Though it's still anemic when it comes to 144Hz gaming. For now, only i7 can properly support it.
3. It's actually 2.5, but it's a bit a subject on it's own. ryzen performance is HUGELY affected by RAM speed due to data fabric working on RAM speed. So to get the most of ryzen, you need 3000+ MHz DDR4 kit. in order for it to work on such speed, it has to be single rank and with samsung chips. they are not cheap.
without knowing the purpose of this build, i can't say much more.

well, I'm in IT field as well. SW development.
though I rarely do hardcore codding, I do a lot of scripting, databases, BI and other things.
I was surprised that a dual core i7 in macbook pro 13" would be able to be my workhorse (corporate device) and replace conventional workstation. A superfast SSD with great IOPS does the trick unless you running a build server on your machine. So for normal IT work, 4/8 cores/threads are more than enough.
I'm also Linux nerd, so my OS of choice is Gentoo. It compiles most of the packages as part of installation - so I do find the many cores useful as compilation can be very parallel. In Ideal world, my gaming rig (the Beast that I call Frostbite) would be also my everything else (have a laptop for that). Unfortunately, my CPU does not support VT-d which allows direct HW passthrough. If it had, I'd be running the Gentoo as base OS and a windows VM with dedicated GPU for gaming. Currently, Ryzen does the iommu very poorly due to weird group assignment. It's a first no go for me. Second one is the lack of integrated GPU. It has to be 2 GPUs to run VM with dedicated GPU. And I see no reason to have two dedicated GPUs (also my "less is more" religion dictates mini ITX) when only one is actually used.
So for myself, if I had to do it today, I'd get an i7-7700K based build with GTX 1080 or 1080Ti and 32GB of RAM + 3440x1440p@100Hz monitor.
In ideal world, there would be a 6-8 core CPU @4.5-5.0GHz with integrated GPU on mini ITX MB with at lest 64GB RAM + very compact (AMD's nano style) GPU with the performance of at least GTX 1080Ti + 3440x1440p@144Hz IPS monitor.
Since I do not need to build today, I wait for what I want. Well, except the monitor. Couldn't live longer with 24" 1920x1200 monitor
So it comes down to following questions:
1. What are your preferences and their priority? big or compact, shinny or functional, quiet or don't care, air or liquid, gaming or productivity etc.
2. An approximate budget for this fun.
3. Your target resolution and refresh rate - i strongly recommend 1440p@144Hz or an ultrawide with 100Hz. BTW, HDMI 2.1 was recently approved, it can do 3440x1440 at 144Hz or 4K at 120 and has all kinds of HDR and more interesting built in VR (variable refresh rate) which will replace the G-Sync and FreeSync - yay !!! monitors with HDMI 2.1 will start to appear very soon I guess. Guess both AMD and Nvidia will include HDMI2.1 in their Vega Volta - they usually do support new standards very quickly.
4. Do you have/want to buy it now ? intel is announcing it's next high end consumer platform any day. both AMD and Nvidia to present their real next gen cards (Vega and Volta) very soon. that's not happening very often. I'd wait till announcements to decide if i want to wait more or not.

Frankly, I'd keep only the SSD
well, no, I'd take the 1TB version to make sure all my crap fits. though i'm under 300GB for windows with OS, programs and games. but I have my FLAC collection on NAS.
The case is nice, but it's tempered glass era. acrylic windows are so scratchy. and really 5.25" bays in 2017 ?
for the 1800-2000$ budget:

CPU: Intel - Core i7-7700K 4.2GHz Quad-Core Processor ($329.75 @ OutletPC)
Motherboard: Asus - PRIME Z270-A ATX LGA1151 Motherboard ($149.49 @ SuperBiiz)
Memory: Corsair - Vengeance LPX 32GB (2 x 16GB) DDR4-3000 Memory ($259.99 @ Amazon)
Storage: Samsung - 960 EVO 500GB M.2-2280 Solid State Drive ($247.99 @ B&H)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC Black Edition Video Card ($709.99 @ Jet)
Case: be quiet! - Dark Base Pro 900 (Black/Orange) ATX Full Tower Case ($239.99 @ SuperBiiz)
Power Supply: EVGA - SuperNOVA G3 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.99 @ Newegg)
Total: $2017.19

Alternatively, same as above just with GTX 1080 and i7-6800K + X99 MB - about the same price.

I have not included CPU cooler, it's 50-80$ for air. or 150 for liquid CPU or 350-600 for a liquid CPU+GPU.

IMPORTANT NOTE:
grab this PSU today, it usually goes for 100+

Haven't we discussed the "wait" thing ? a week or so for the AMD to announce Vega, for Nvidia with Volta, for Intel with i9 ?
BTW, some of the parts were color matched - like the MB and RAM. you can change the ram to black if you want - same everything just the color.
Also, the case is with orange accent - i like it, but there is also a black/silver version.

Also, this build is completely without any lighting. you are free to play with it

the liquid is a nice to have. it allows you comfortably overclock the CPU to the sky and yet not worry about the temperatures.
It's also cool looking with RGB and tubes.
this one I had in mind for CPU http://www.swiftech.com/h240x2.aspx
there is also a 320 version which i'd recommend if you thinking about adding the GPU as well. to add GPU, you will need a GPU block + backplate and another 240 rad + couple of fittings - under 250 in total.
Building a loop like mine, will be in 500-800$ range depending on the components you pick. there is very cool staff if you are brave enough. But that's more of a hobby, than practicality.

Practically - this should be more than sufficient - https://pcpartpicker.com/product/9bFPxr/be-quiet-cpu-cooler-bk019
As a side note, I prefer the Noctua NH-D15, but not everyone agrees with the fan's color.

same applies to CPU !!!