Amdmb.com has posted an review of Chieftec's AH-01SL Aluminum Midtower Case.
I think this case is the best bang for the buck aluminum case you can buy. If you want aluminum, but don't want to spend more than the system that's going to be inside it, Chieftec aluminum cases are the ones the look at. I have personally used a comparable steel Antec case for one of my clients; I don't see much of a difference in cooling performance between steel and aluminum with the same case design. However, the aluminum Chieftec AH-01SL is half the weight filled with a system. Carrying a system to a client, you would like lightweight.More information at Amdmb.com