Tunze Stream pumps are some of the quietest pumps for the price.  We have used these pumps in multiple tank builds and have never been disappointed.  They are not necessarily the cheapest AC powered pumps on the market, however they are very quiet, can be pointed in any direction, and have one of the industry’s best warranty and customer service through Tunze USA. 
German-made Tunze powerheads are one of the best high flow powerheads available. They are smaller and can be hidden in the aquarium easier than competing brands. Tunze pumps can be configured in a wide range of positions to target any area of the tank.
For aquariums from 10-135 gallons
Flow rate: 400-1175 GPH
Manual Flow Adjustor
Energy consumption: 5 to 7W
Cable length: 78.7"”
Diameter: 2.75”
Output diameter 1.5/.59”