With as many case manufacturers and styles as there are in the market right now, it makes sense to start with a purpose built case to put your system in.  If you are going to agonize over every component on the inside, give the case some consideration too.  Silent PC Reivew examines the Nexus Breeze Real Silent Computer Case, which, as you may have guessed, is a good enclosure to build a quiet PC in.
“Nexus Technology is addressing the problem of noisy computers head-on with their new Nexus Breeze Real Silent computer case. The Breeze was specifically designed to be very quiet and comes equipped with a unique airflow system, Nexus case fan, noise absorption material, and a Nexus power supply. The Nexus Breeze is an oversized mid-tower ATX enclosure featuring a sturdy steel chassis with plastic trim and elegant styling. The Breeze is available with your choice of a Nexus 350W, 400W, or 500W SLI Ready power supply.”

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