Hi, me again. I can recommend the Redwing 80mm and 120mm fans. Not silent but quiet and the 120mm has a decent airflow (80mm has average).
Double check your case fans to make sure they're 120mm though. My last case had 80mm fans.
120mm fan click here
An expensive way to get a better airflow may be to buy a big case with 120mm fans and rebuild it in that.