A 67 year old man presents with a 3 day history of fever, productive cough and pleuritic chest pain. He is febrile, has a respiratory rate of 22 breaths/min and oxygen saturation of 95% on room air. Chest auscultation reveals right lower zone crackles and chest X ray confirms right lower lobe consolidation. He has no major comorbidities and is stable for community management. According to Australian antibiotic guidelines, which is the most appropriate empiric oral antibiotic regimen?