The Antec Fusion seems aptly named, a mix of HTPC style, with some serious cooling.  It is very easy to set up with the colour coded instructions and the quiet power supply and 120mm fans don't make that much noise.  Take a look and see if you are as impressed as Overclockers Online.

"We generally don't find many mATX multimedia cases tailored for an overclocker. These cases are

generally cramped resulting in terrible airflow and high temperatures. The Antec Fusion has resolved

that issue. It's spacious interior allows for some of the larger heatsinks and the two 120mm

tri-speed fans does wonders on reducing the overall system temperature."

Here are some more Systems articles from around the web:

  
HTPC

• Antec

  Fusion Media Center Case @ ThinkComputers

• Zalman

  HD135 HTPC Case Reviewed @ MetkuMods

• Best of Both Worlds

  with the Mozart Tx @ Legion Hardware

• Zalman HD135 HTPC

  Case Review @ Madshrimps

• Thermaltake VC4001SNS Mozart

  HTPC Case Review @ MODTHEBOX

• ASRock ConRoe945G-DVI:

  Core 2 Duo goes mATX @ AnandTech