I suppose you want to have an entire cluster, not just one machine, right? Otherwise you'll wait for results forever. You can check out the configuration of the theoreticians here in Freiburg (not a big group, but it works):
Of course you have to know whether you intend to use GPU- or CPU-based systems (check out https://en.wikipedia.org/wiki/List_of_quantum_chemistry_and_solid-state_physics_software) and adapt your system to that.