Are you going to be streaming and gaming on the same pc? If so, 8 GB of ram may not be enough and that CPU is not enough to do both. For CPU I would get a Ryzen 5 2600 because they are really nice for the price. Or if you like Intel, you could get the i5 8400 but they are going up in price for about $200 USD. They offer about the same performance. Also, You may want a SSD to make the game load faster and for the system to load faster. And for the GPU, the CPU limits the performance of it or as some say, "Bottleneck". Oh and the PSU is a bit overkill because that system would use less than 300W.
Here is a build I made for you if you are streaming and gaming on the same pc:
CPU: AMD - Ryzen 5 2600 3.4 GHz 6-Core Processor ($159.89 @ OutletPC)
Motherboard: Asus - ROG STRIX B450-F GAMING ATX AM4 Motherboard ($124.01 @ B&H)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($139.99 @ Newegg)
Storage: Samsung - 860 Evo 500GB 2.5" Solid State Drive ($82.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($58.89 @ OutletPC)
Video Card: EVGA - GeForce GTX 1070 8 GB SC GAMING ACX 3.0 Black Edition Video Card ($379.99 @ Newegg)
Power Supply: EVGA - SuperNOVA G3 550 W 80+ Gold Certified Fully-Modular ATX Power Supply ($67.99 @ Newegg)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($94.89 @ OutletPC)
Total: $1104.54
If you are only doing streaming, then you need a better CPU than the i3 8100. Streaming requires more CPU power than graphics because the CPU encodes the video to be streamed. It does not require graphics power. If you are only doing streaming, the use thebuild above and just get a lower end GPU. Which should bring your cost to just above yours.
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