The pilot stated that he was returning to his home airport at the conclusion of a local flight, and that he aborted the first landing attempt due to turbulence and wind gusts. Following a second approach for landing, the airplane encountered a "gust of wind" from the left during the landing flare. The airplane banked right, and the nose landing gear subsequently contacted the runway "hard." Postaccident inspection revealed that the propeller had struck the runway during landing, and further examination revealed substantial damage to the engine firewall. The pilot reported there were no mechanical malfunctions or anomalies of the airplane that would have precluded normal operation.