Luft Pumps are the best I've ever used by far
I totally agree with Unirdna. These air pumps are silent, rugged, reliable and easily adjustable. I ran one for over 8 years and then loaned it to Unirdna, and he has used it for 2 or 3 years. Neither one of us did any maintenance to it, and it still runs like new.
This may seem like hyperbole, but after all of the pumps I've used for over 30 years, I have not seen anything close to its equal. At around $50.00 they are a little more expensive, but worth every penny, since you will never have to replace it.