Personally using Corsair LL140s for unicorn spotting. Function wise. As you mentioned, Noctua would be my first stop. After that I would consider BeQuiet silent wing 3. Corsair MLs though I have only used them in 140mm.
I would approach it like this. Write a list of the 10 fans you can actually afford. Go into each one and see what you find in reviews. It's what I do. Once I am settled in a top 3 then decide based on what I can get and for what price. For example, I'd wait until there is a bank holiday or start tracking the price using price spy or something. There are discounts here and there all year round.
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