Are the apps going to be served or running off of the individual workstations? If off the wrksta then a single CPU server will do fine, especially if its only going to be a file & print server or exchange server. If the apps are served which usually is only for databases not programming apps go with dual. CPU's should be nothing less than 2Ghz for worthwhile investment. With only (10) users thats all you should need. (3) 40-80 GB Hdd for Raid striping w/ parity (redundancy is good), max the ram (512 at the least).