When your concern is maintaining good airflow without too much noise, fans are vastly more important than the actual case. With a great set of fans, that would run cooler in a mATX case than it would in a big tower with passable fans.
I think I get where you are going in terms of aesthetics, so my short list for you: Shinobi XL, Fractal Arc, Define R4, Lian Li PC-90 (consistently on sale for $100 or so), and *maybe* the Ghost. I only say maybe as I'm hesitent to recommend anything I haven't played with myself.
For fans, BitFenix Spectre Pros, Corsair AF Quiet Edition (my new favorite fans), Noiseblockers, or Noctuas. With some of the cases listed above (Fractal and BitFenix) you can get away with adding a few fans while retaining the stock ones. I think the R4 is the first case where I have actually done that in years.