It depends on whether you are optimizing for performance (high airflow/CFM), quietness, or a best-of-both-worlds approach.
For the side intake fans, I like
these 120mm fans. Got them for front intake of a mid tower and they seem to be doing their job helping to cool two R9 390s. I'll admit, I partly got them because they look cool.

Noctua does make the best or some of the best fans, though, if you don't mind paying a little more. I got one of
these a few weeks ago, moves a lot of air quietly.
For the 80/92mm mounts, I'd get
this Zalman one or
this Noctua one (or
this one also from Noctua, if you don't like grey and don't mind paying a little more). I haven't tried either - I usually don't use 80 or 92mm fans, except for a recent
Arctic F9 purchase which I'm happy with - but the reviews and specs look good for both.
I have no experience with Be Quiet!, but I was looking at getting a few Pure Wings 2 (140mm) fans. Customer reviews for their fans look okay on Newegg, overall. I'm going to "risk" it, as most fans have a few negative reviews here and there from random failures.