CM Standard Blue LED - 90CFM @ 2000RPM (Long-life Sleeve Bearing less noisy compared to ball based bearings,not very long lasting needs maintenance and prone to changes due to thermal inconsistency)
CM Excalibur - 85.6 CFM @ 2000RPM (Barometric Ball Bearing : read better build,long lasting and silent)
CM Xtraflow - 82.9 CFM @ 2000RPM (Long Life Sleeve)
Now if you want move more air then its a no brainer but to buy the CM Standard Blue. CM Excalibur though robustly built costs an insane Rs 1900 for a 120mm fan.CM xtraflow give it a miss.