Just saw this over at NCIX might make a decent starter with a ram and CPU upgrade
HPE ProLiant ML10 GEN9 G4400 4GB-R NON-HOT Plug 4LFF SATA 300W Entry Server for 366$
HPE ProLiant ML10 GEN9 G4400 4GB-R NON-HOT Plug 4LFF SATA 300W Entry Server for 366$