Best PC setup for Multiple VM management - PLEASE HELP!

[SoundsGood]

Create a single VM and connect it to all 20 VPNs.
Inside that VM start up 20 instances of chromium & VNC inside docker (something like https://hub.docker.com/r/consol/ubuntu-xfce-vnc/).
Configure each container to route through a different VPN gateway using nsenter (https://bunn.cc/2017/nsenter_network_namespace/)
Connect to each container over VNC from your normal machine

That should run on any semi decent machine. I'd recommend something like a Dell T30 or a HP ML10

 

[Grandmaster Fap!]

The OP might also look at this thread where two eminently suitable systems are for sale.

I suspect he cant see those due to post count :/

 

[Bossmatics]

For your budget ebay is your best hardware option. I've bought a couple of Dell R410's (2x6 core Xeon's, 32GB, Dual PSU and 2TB RAID) for about £400 each a while back. Have had them running VMWare 24x7 for 12 months with no issues, would give you more redundancy than other options.

For your purposes though it's worth looking at alternative cloud options etc. Running Windows VM's on a server seems a pretty crude way to achieve what you are doing.

If I buy an R410 can I set it up with Windows as usual. Just plug it it then connect a HDMI port to it and it will run like a normal PC?

 

[dulcificum]

In that case take a look at sessionbox as I mentioned above. If it works for you it would be cheaper than building a PC to run 20 VMs.

Create a single VM and connect it to all 20 VPNs.
Inside that VM start up 20 instances of chromium & VNC inside docker (something like https://hub.docker.com/r/consol/ubuntu-xfce-vnc/).
Configure each container to route through a different VPN gateway using nsenter (https://bunn.cc/2017/nsenter_network_namespace/)
Connect to each container over VNC from your normal machine

That should run on any semi decent machine. I'd recommend something like a Dell T30 or a HP ML10

You don't even need Docker or solutions like this.

One PC, one OS install, separate Chrome profiles with built-in VPN profile on Proxy SwitchySharp or similar for each LinkedIn account.

Sorted.