In case your wondering, I'm using this, because I want a rock hard stable computer, and a big one with good cooling.
The TT Armor is huge so it has good airflow and seems to be very popular, but...
The case fans are notoriously loud, the 120mm ones are variable speed, but I've heard they usually run at top speed, which is like 48dBa, compared to tehre 17dBa advertised spped, thats way to loud for me, and I'm guessing (can't fine them on newegg seperate from the case) the 2 90mm fans are variable too, because they're rated at 19dBa. And then theres the iCage, I don't know what fan it uses, but its a 120mm blue led fan, but its not the same as the other 120mm blue fan.
So basically, I need to replace the 120mm rear exaust fan with a quiet one that pushes more then 30cfm of air (can be less). In my opinion the Scythe S-FLEX SFF21E 1200rpm is the best option, because it pushes quiet a bit of air, and is VERY quiet.
But thats only 1 fan, out of 4 (I don't need to replace the 250mm one)
I honestly didn't read the whole post of yours at the beginning
but as I understand it... 25CFM isn't too much air being pushed through
A lot of times I personally will take 120mm fans over 80mm reason being they have a higher surface area and because of that they do not have to spin near as fast to move the same volume of air.
Problem a lot of times is cases come with preinstalled 80mm fans. I honestly would recommend all 120 mm fans if I could, I feel it would make a quieter case + pushing the same amount if not more air...
I would look for fans with a 30+ CFM if you could, (if you really want to move some air in complete negligence of peace and quiet, frozencpu.com sells a fan with 109CFM however it's 250mm)