I've seen a few posts with users talking about fan pressure and then saying it's more important than cfm. These users have read something they don't understand but they want to sound smart.
Pressure equals Force divided by Area
Force = Mass x Velocity
Area = The size of an object or in our case the size of the fan or 120mm x 25 mm or 120mm x 38mm.
So with this info lets look at what we've got to work with, Force and Area.
Force = Mass x Velocity, and the Mass of air is determined by it's density. The only way were going to increase the Density of air (in a home environment) is by temperature or altitude. Cold air is denser than Hot air. Our fan cannot control the Mass or Density of air. So this variable has no bearing on our selection of a fan. Velocity, our fan can control the Velocity of the air. The Velocity of a fan is expressed in cfm or Cubic Feet per Minute, the key words are "per minute" which is defining a speed or Velocity just like Miles or Kilometers "per hour".
Area, we can also control this to an extent, we can buy a larger fan. A 120mm x 38mm fan has a larger Area than a 120mm x 25mm fan.
CFM and Area are the only values we can control when looking for a fan with maximum airflow in mind. If you have (2) equal sized fans with the same CFM rating and one is listed as having a higher Pressure then someone is a liar or they performed the testing in an artificial environment to increase the normal air density.
With all of that said I'm using these with my True Copper.
SilverStone FM123 120x120x25mm w/ Fan Controller - (FM123) - FrozenCPU.com
I'm using these fans with a Standard True on my Office Workstation.
Cooler Master 120x25mm Dual Ball Silent Fan - Blue LED (Y720DCD-25T1-GP) - 110.0CFM - FrozenCPU.com
If I was going to buy a Red LED Fan I would probably try these.
Newegg.com - COOLER MASTER R4-L2R-20CR-GP 120mm Red LED Case Fan - Case Fans