It's a hard sell with modern CPUs getting so much faster. At a previous company most of our office build & test machines were refurb HP Z620 or Z640s from a res

It's a hard sell with modern CPUs getting so much faster. At a previous company most of our office build & test machines were refurb HP Z620 or Z640s from a reseller called TekBoost (no relationship). Worked great back then. It might still make sense if RAM quantity is the main constraint on your workflow, you can get a >256GB machine for under $2000, but otherwise modern machines are going to be faster and less hassle.