I used to use a Lenovo ThinkServer SR250 V2 and a few Dell PowerEdge R210 II servers powering the home lab. The reason is that I managed to grab a steal on some used enterprise gear. It became almost an obsession to browse classified websites for hours to spot any deals on older hardware that could be used inside the home lab. These deals always appeared almost too good to be true. Even some multi-CPU systems would cost as little as $100 if you looked long and hard enough.