Wakes Inc

Probably neither, what's your budget/country? If it's an entirely new PC, you should just build a Ryzen APU system, and save the rest for a next gen GPU in a few short months.

Here's something else
https://ca.pcpartpicker.com/list/FCfXbX
 
Let's see
>Why the A320? well it's for a NAS not for a gaming rig, it's cheap but still good
>The 2200, newer but also about the same price as the 1200, the gpu is more than enough for video sharing or whatever you're gonna do with it
>Having less hard drives is better and also cheaper, you even have room for a SSD that's entirely for the OS and related software, it might not be the best but it's reliable for 24/7 use, it allows you to dedicate the HDDs entirely to storage
>The case, I only changed it because it has an extra 3.5" bay just in case you upgrade later
>PSU... it'll do, cheap, decent quality and basically overkill for that system
>A fan, the drives will generate a lot of heat and you'll have to remove it somehow
 
The BIOS is already updated, unless the store still has the old board version in stock... in that case you'll need to tell them to send you an updated version

If you are willing to buy some used equipment, 10g networking is definitely within your reach if you still want it.  Used dell switches with sfp+ ports are pretty cheap, at least in the states.  Not sure about europe.

I would contact a local authorized Supermicro reseller and get them to part out a server and workstation build for you, they do both as well as gaming systems so if you do all of it with them you're more likely to get good pricing.
 
I would also get a smaller server rack, 12U to 24U, to put the equipment in and use a rackmount server not a tower, towers have limited HDD bays. Something like this is a good base platform as you won't need dual socket, will need to add a dual port SFP+ NIC to it but reseller can sort all that stuff out.
https://www.supermicro.com.tw/products/system/2U/5028/SSG-5028R-E1CR12L.cfm
 
Allied Telesis are very well priced so something like an x510-28GTX will do everything you need, HPE also have similar well priced switch options. I don't really like Netgear or D-Link myself so I avoid them and Cisco isn't exactly price competitive.

I'm not sure what the OP means when he references a "RX Vega 16 gig" but the Radeon Vega Frontier has consistently been in stock for $1k or less.  It's available brand new, in stock, for $950 from newegg.

LOL.  Unless I missed something, the 1080Ti I was looking at literally went out of stock while I had the page open.