Shimano free wheels run about 25.00 - 30.00, take a beating, and run quietly... there is not a better value out there if you are $$$ conscious. I used one on my winter bike for years and it still sees service and runs as well as it did on day 1.
The white industries is awesome... but it is $100.00
I don't find ACS freewheels to be worth their cost.
Old Suntour free wheels are incredibly nice but are hard to find.