Need Help For Building Gaming + Streaming pc

So I am currently looking into building my first Gaming/Streaming PC setup and have ran into a few questions that I haven’t been able to find answer too. My setup so far looks something like this.

[PCPartPicker part list](https://pcpartpicker.com/list/V2LMPs) / [Price breakdown by merchant](https://pcpartpicker.com/list/V2LMPs/by_merchant/)

Type|Item|Price
:----|:----|:----
**CPU** | [AMD - Ryzen 5 1600 3.2GHz 6-Core Processor](https://pcpartpicker.com/product/mV98TW/amd-ryzen-5-1600-32ghz-6-core-processor-yd1600bbaebox) | $196.97 @ OutletPC
**Motherboard** | [MSI - B350 TOMAHAWK ATX AM4 Motherboard](https://pcpartpicker.com/product/Y4kwrH/msi-b350-tomahawk-atx-am4-motherboard-b350-tomahawk) | $65.98 @ Newegg
**Memory** | [Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory](https://pcpartpicker.com/product/2skwrH/corsair-memory-cmk16gx4m2b3000c15r) | $204.89 @ OutletPC
**Storage** | [Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive](https://pcpartpicker.com/product/3kL7YJ/samsung-internal-hard-drive-mz75e250bam) | $89.89 @ OutletPC
**Storage** | [Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive](https://pcpartpicker.com/product/CbL7YJ/seagate-barracuda-2tb-35-7200rpm-internal-hard-drive-st2000dm006) | $59.99 @ Amazon
**Video Card** | [Gigabyte - GeForce GTX 1080 8GB WINDFORCE OC 8G Video Card](https://pcpartpicker.com/product/V4M323/gigabyte-geforce-gtx-1080-8gb-windforce-oc-8g-video-card-gv-n1080wf3oc-8gd) | $785.91 @ Newegg Marketplace
**Case** | [Cooler Master - MasterBox 5t ATX Mid Tower Case](https://pcpartpicker.com/product/wHX2FT/cooler-master-masterbox-5t-atx-mid-tower-case-mcx-b5s3t-rwnn) | $69.99 @ Amazon
**Power Supply** | [Cooler Master - 750W 80+ Gold Certified Fully-Modular ATX Power Supply](https://pcpartpicker.com/product/RkX2FT/cooler-master-power-supply-rs750afbag1us) | $95.98 @ Newegg
| *Prices include shipping, taxes, rebates, and discounts* |
| Total (before mail-in rebates) | $1619.60
| Mail-in rebates | -$50.00
| **Total** | **$1569.60**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2018-01-05 10:06 EST-0500 |

i already have a gtx 1080 + psu so those parts i can not change.
I need your opinion on mobo + ram + case.
Hope u guys can help me
have a nice day all