I’m in the process of building myself an IP PABX at home, but in order to do that I needed a machine to build it on, so I searched around, and found myself all the bits I needed, well, almost all, because it turns out I need a motherboard with PCI 2.2 slots in it, so I ordered a board off ebay.
It was a Compaq board, but it looked fairly standard, till I went to plug the power supply in and found the socket was 24 pins, where standard ATX is only 20. So I emailed the guy, and he sent me a power supply for it, couriered, no charge!
So I have no hesitation whatsoever in recommending dinosaur_pc
I’ve too much other stuff to do at the moment to build it, but at least I think I have all the bits now!