I picked up 2 120mm Scythe fans from Newegg for $15 a piece. They're slightly louder than the stock fans on low and they lowered my motherboard and graphics temps a few degrees. Other than that I'd leave the stock fans.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.