Just a quick question. Would using a shroud to direct airflow be an effective way of directing airflow?
I've seen this done on Dell computers but I'm not sure how effective it is.
I have Silverstone AP-181's which use a grill to direct airflow in a narrower beam.
You could also try doing something like thishttp://www.sunbeamtech.com/PRODUCTS/Quarterback/Quarterback.html
to increase airflow in the middle of the case.