You'd be better with a Fractal Define R5 or Antec P180-series, with a couple of large slow fans. These are both heavy-built cases with internal sounds damping and limited noise paths. You should aim to have a single clear airpath from bottom/front to top/rear, with no shortcuts for cold air to leave early or enter late. Have more intake airflow than exhaust to limit dust and fluff.
http://www.nofancomputer.com/eng/products/CS-80.php
All those vents aren't going to help much.
You'd be better with a Fractal Define R5 or Antec P180-series, with a couple of large slow fans. These are both heavy-built cases with internal sounds damping and limited noise paths. You should aim to have a single clear airpath from bottom/front to top/rear, with no shortcuts for cold air to leave early or enter late. Have more intake airflow than exhaust to limit dust and fluff.
5 pages of R5-based build guide:
http://www.silentpcreview.com/Quiet_ATX_Gamer_R5_Version