I need a good dust-free case?

[ZoSo]

I'm going to be building a new system soon and I want to get another case.
The environment is kind of dusty so I need something that can keep the dust from getting in yet have adequate air flow.
I have a P160 now and had to modify it so that the only air coming in was directly through the filter. Without doing so, it would draw air from all of the vent holes around the front bezel, which would end up very dusty.
I would like it to also be aluminum.

Thanks

 

[x_dreamer]

antec p180, except its a heavy turd.