so I know this is a tad old now but created an acct to see where the OP went with this.
With ESXI 6.7 out.. any W or X Cpu is no longer going to work. You need an E3/E5 or E7 cpu.
now not sure where the OP went with what he got if anything, but I am using a Dell D30 I got off of ebay cheap!!!!! and it is a dual E5-2620 cpus and each are 6 core. I then have 128gb ddr3 memory, 3x2tb wd black drives and 2x 500gb ssd drives.
now this thing is QUIET!!! I mean SUPER quiet.. I'm an HP fanboy and at work I have an HP Z800 (which will not run 6.7) and it is way louder but not as loud as an actual server. You would need an HP Z820/840 but they are extremely expensive.
so this thing is a tower, just an oversized tower fairly small and can sit under a desk and be nice and quiet and fast with a budget at mind.
my problem now is I'm trying to figure out what pro workstation class has 4cpu's !!! HAH.. don't really need it but why not...
fyi - check out my videos on youtube as I have how to setup a VMware lab, how to setup some home automation, Altiris (my main job function in life)...
https://www.youtube.com/c/JeffreyRiggs