I haven’t been so tempted to search eBay for retrocomputing hardware in a long time.
I used to collect whatever old enterprise Unix gear I could get for very cheap, including several Suns, an HP-UX box, and a couple of SGI machines. I coveted a Sun Ultra 45 / Power Mac G5 combo, because they were the most powerful non-PC workstations and also because I thought they would look so cool side to side. I’m also jealous of that SunPCi card. I did have a couple of little SBC PCs on PCI cards, but they were all industrial things that were smaller, slower, and with worse hardware support.
I think I need to go spend some time in a datacenter now.