Actually, setting up a server rig for this sort of thing can actually be done rather inexpensively with a LOT of power.
You can pick up NEW tray CPUs, 14 cores, for $400. (Xeon 7940X). Depending on when you buy, you could get up to an 18 core 1980XE.
An X299 board for the thing is about $200-400.
Throw 64GB of RAM and a decent SSD into the thing, and you have a perfectly acceptable virtual host.