CCL: A DFT calculation for Cd and sulfur nanoparticle

 Sent to CCL by: "sina  rastegar" [snrstgr535[-]]
 Hi All,
 My system has 600 atoms including cadmium and sulfor, I am interested to do DFT
 calculation (electronic structure study) for the system.
 What kind of software is more affordable and what level of theory is the best?
 Thanks in advance,