first build

[trashmonster4]

So the budget is 800-850$ if possible have it be able to upgrade the parts later

PCPartPicker Part List

Type	Item	Price
CPU	Intel Core i5-8400 2.8 GHz 6-Core Processor	$189.99 @ Best Buy
CPU Cooler	Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler	$39.99 @ B&H
Motherboard	Asus TUF Z390-PRO GAMING ATX LGA1151 Motherboard	$169.99 @ B&H
Memory	G.Skill Ripjaws V Series 16 GB (2 x 8 GB) DDR4-3200 Memory	$74.99 @ Newegg
Memory	G.Skill Ripjaws V Series 16 GB (2 x 8 GB) DDR4-3200 Memory	$74.99 @ Newegg
Storage	Samsung 860 Evo 500 GB 2.5" Solid State Drive	$84.99 @ Adorama
Storage	Hitachi Ultrastar 7K3000 2 TB 3.5" 7200RPM Internal Hard Drive
Video Card	MSI GeForce GTX 1050 Ti 4 GB GAMING X 4G Video Card	$160.97 @ B&H
Case	NZXT S340 ATX Mid Tower Case
Power Supply	Corsair CXM (2015) 450 W 80+ Bronze Certified Semi-modular ATX Power Supply	$69.99 @ Newegg
	Prices include shipping, taxes, rebates, and discounts
	Total	$865.90
	Generated by PCPartPicker 2020-04-02 01:20 EDT-0400

Edit: a gaming build that also streams

[Slottr]

Part prices kinda suck right now, but here you go:

 

PCPartPicker Part List

Type	Item	Price
CPU	AMD Ryzen 5 3600 3.6 GHz 6-Core Processor	$174.99 @ B&H
Motherboard	ASRock B450M PRO4 Micro ATX AM4 Motherboard	$83.98 @ Newegg
Memory	Team T-FORCE VULCAN Z 16 GB (2 x 8 GB) DDR4-3000 Memory	$67.99 @ Newegg
Storage	HP EX900 250 GB M.2-2280 NVME Solid State Drive	$45.99 @ Newegg
Storage	Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive	$54.98 @ Newegg
Video Card	EVGA GeForce RTX 2060 6 GB XC ULTRA BLACK GAMING Video Card	$323.98 @ Newegg
Case	Cooler Master MasterBox Q300L MicroATX Mini Tower Case	$44.99 @ Best Buy
Power Supply	Corsair CX (2017) 550 W 80+ Bronze Certified ATX Power Supply	$69.29 @ Newegg
	Prices include shipping, taxes, rebates, and discounts
	Total	$866.19
	Generated by PCPartPicker 2020-04-02 01:12 EDT-0400

Assuming it's for gaming?

[Daniel Z.]

PCPartPicker Part List

Type	Item	Price
CPU	AMD Ryzen 5 3600 3.6 GHz 6-Core Processor	$174.99 @ B&H
Motherboard	ASRock B450M PRO4 Micro ATX AM4 Motherboard	$83.98 @ Newegg
Memory	GeIL EVO POTENZA 16 GB (2 x 8 GB) DDR4-3200 Memory	$67.99 @ Newegg
Storage	Team L5 LITE 3D 480 GB 2.5" Solid State Drive	$59.99 @ Newegg
Video Card	MSI Radeon RX 5700 XT 8 GB MECH OC Video Card	$359.99 @ Newegg
Case	HEC HX210 MicroATX Mini Tower Case	$34.98 @ Newegg
Power Supply	Corsair CX (2017) 550 W 80+ Bronze Certified ATX Power Supply	$69.29 @ Newegg
	Prices include shipping, taxes, rebates, and discounts
	Total (before mail-in rebates)	$871.21
	Mail-in rebates	-$20.00
	Total	$851.21
	Generated by PCPartPicker 2020-04-02 01:18 EDT-0400

 

[Sorenson]

PCPartPicker Part List

Type	Item	Price
CPU	AMD Ryzen 5 1600 (12nm) 3.2 GHz 6-Core Processor	$99.99 @ Newegg
Motherboard	MSI B450 TOMAHAWK MAX ATX AM4 Motherboard	$114.99 @ Best Buy
Memory	G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 Memory	$76.99 @ Newegg
Storage	Crucial P1 1 TB M.2-2280 NVME Solid State Drive	$109.99 @ B&H
Video Card	XFX Radeon RX 5700 8 GB DD Ultra Video Card	$329.99 @ Best Buy
Case	NZXT H510 ATX Mid Tower Case	$69.99 @ Best Buy
Power Supply	SeaSonic S12III 650 W 80+ Bronze Certified ATX Power Supply	$64.99 @ B&H
	Prices include shipping, taxes, rebates, and discounts
	Total	$866.93
	Generated by PCPartPicker 2020-04-02 01:31 EDT-0400

I would go with something like this, spending more on a decent case so you can use it as you upgrade your system. The Ryzen 5 1600 I linked is the 12nm which is basically a 2600 in everything but name. I think for $70 less than the 3600 it’s a pretty good deal, but the 3600 will last you longer. 
 

 

[SavageNeo]

Tehre are some good buils, so i wont create my own homever i will talk about your choices.

 

cpu: i5 8400. is 6core 6 thread cpu with under 4ghz turbo. And ryzen 5 3600 has 6cores, 12 threads and over 4ghz turbo. Ryzen 5 3600 is way better than i5 8400.

gpu: 1050 ti sucks. Rtx 2060 KO is much better. Like its unbelievable better.

psu: instead of cxm get cx 550w. Cx has modular cables, cxm is semi modular.

ram: 16gig is enough for every game