Just remember, aluminum cases can and most often will rattle a little bit. You may have to monkey with padding them in certain places to keep them from making noise. I've had this issue with Lian Li's so they're not immune.
That being said, I always run Al cases because they have better heat rejection and are lighter to carry around. My main rig is built into a Lian Li full tower server case. Great air flow, tons of space and nice cable routing.

