Unfortunately, all in ones have a wide variation in pump noise eve in the same model.
I have an H80i and the pump is very quiet(Even with the fans on low[I had Noctua fans on it at the time], I could not hear it without being right next to it). Others have had issues with the same cooler. My Zalman LQ310 (Asetek rebrand) has a loud pump that sounds like a hard drive seeking(it has become more quiet with time, but is still loud compared to the H80i I have).
I would go for 140mm if you can because they will cool better with a slower fan, but make sure you get something from a store you can exchange if it is too loud. Many reviews will also cover pump noise(but again it varies).