Well I am amazed at this (if you are referring to the Antec P180) as it is widly acclaimed by a great many independant reviews for its quietness (of course if you put a vacuum cleaner inside it it will still be loud), and it is possible for little extra money to replace the supplied case fans to those that are a bit quieter.
I always respect Custom PC Labs and Reviews as if something is poor or not up to the mark they say so quite clearly - even thought other 'reviewers' rave about it and regardless that it may upset their advertisers. Such honesty is refreshing, and in a mega case test the Antec P180 came out as best for airflow and cooling bar none. They also remark on how quiet it is - scientifically measured - not subjective.
Antec P180 for me (I also have an Antec Sonata and it too is quite quiet).