The AP182 woudl wreck any 120mm fan on the market, 2000rpms on a 180x32mm frame will move a ton of air, but at the expense of noise, still it would kick the pants of any 120mm in the market... well idk with the supersonic deltas... but my guess is they will.
Now if you go with 180s, check phobias rads, they have some that have been used on TJ08-E builds instead of using 1080s. Now if you want to use 1080s, go with 120s. There are also 200mm fans like Phanteks, though worth mentioning that they are not a standard square frame.
Now with the clicking....can happen to any fan, i have had batches of 12 noctuas, 11 didn't click and one did, so i wouldn't worry to much, its not something that can be fully avoided or that there is a brand or a fan that is click free...
What I mean isn't maximum CFM but the CFM to noise ratio. From what I've read, 120mm fans beat even the best 140mm fans in terms of their ability to produce the same amount of cooling at low RPM quietly. That shouldn't be the case. 180mm fans and 200mms, even more so, should be able to produce more cooling for the same amount of noise. However, I can see that dead spots and motor noise can become an issue once fans get to a certain size.
The clicking concern was mainly about the sheer number of fans if one uses 120mm fans rather than 180mm fans. A very low RPMs some fans click more than they do at a slightly higher RPM. While the 180s may have to spin a bit faster to produce the same amount of cooling, the issue is whether or not their overall noise level (clicking included) will be lower than having so many 120s. Cost is also an issue, as it's much cheaper to buy eight fans than it is to buy eighteen!