I have the Lian-Li 2100B (only difference is a front lockable door I think).
Anyway, have you noticed that the HD units become extremely hot, even with that area's exhaust fan??? The eight I have operating did just that before I installed two intake fans below each side-by-side stack of drives that pull air in through the holes in the bottom of the case. Now, the area stays quite cool.
Plus, I attached an "external fan", via double-side foam tape, in the area above the rear exhaust fan where the air is supposed to intake to the mainboard area. It pumps cool outside air into the case at high speed (helps keep the 6800GT card cooler too). The Supermicro utility says the system and CPU's never go above 100F now.
Just my suggestions as you mentioned overclocking it soon.