the pumps that i was referring too for you were the diaphram pumps. the pumps i use do make a noise, which i am not concerned about.
the ActiveAqua diaphram pumps go up to 25liters per minute, those are quite. i am confused about the quantitiy of air you are going for to use in a single small 150 gal tank.
if you have a good KOI store near you they, at least in my area carry diaphram pumps, at least very quiet pumps that have a much larger capacity. they can run well over $100-$200.
there is a big difference in performance between what you can buy at Petco and these pumps. how they handle back pressure is the biggie. good luck.