Quieter options?

So I want to quieten down my fans whilst also upgrading the rear to a 140mm fan.
Xigmatek aquila case
I've currently got a 200mm Xigmatek in the front of the case as an intake.
Most noise seems to coem to from 2X OcUK FQ121WC Watercooling Radiator Fans mounted in the top of the case to my Asetek 240mm radiator.
What are the best options for replacing them with quieter fans?
Also trying to get more airflow through the case, the rear standard xigmatek fan can be swapped for a 140, any good options here?

In general my color scheme is black/orange so any fans keeping in with this is a bonus, especially if they are LED.

There's so many options on the sight and not many reviews.

The colour of the top two 120mm fans doesnt really matter as they are pretty much hidden, so just best bang for the buck there.

The rear 140 I've seen these few

https://www.overclockers.co.uk/bitfenix-spectre-pwm-140mm-fan-orange-led-black-fg-104-bx.html
https://www.overclockers.co.uk/alpenfoehn-140mm-wing-boost-plus-pwm-fan-orange-fg-008-al.html
https://www.overclockers.co.uk/corsair-af140-quiet-series-low-noise-high-airflow-single-pack-co-9050009-ww-fg-006-cs.html

Thanks in advance

How about removing the fans on the radiator completely and changing the rear 140mm fan to an intake? The 200mm Xigmatek fan must produce a considerable flow itself.