i was thinking of either
buying a nas and either run mc server on it. or
buying a new pc, re-purposing one of the pc's as a server.
disadvantages i see
i don't know any nas/nas os that can run a java mc server.
phenom server - high power consumption, motherboard only supports sata 2 (but for HDDs that might be ok) or
pentium server - bearly enough performance for mc server