The Air 540 is a nice case but also collects a lot of dust. Get the Fractal Design Define R4 http://www.amazon.com/gp/product/B008HD3E6Y
. The R4 is a pretty amazing case with noise dampening padding, built in air filters, and support for 240/280mm radiators.
I've go two Fractal cases, the Define Mini and the Node 304 and I will say that Fractal cases are nice to work with and very quiet.