I regard the V-series inwins as the best of the bunch. The v523 and v508 have the best bezels for airflow, stout construction, and nice overall features and appearance. the v508 is currently hard to find, as is the v523 in beige. Logicalplus has one or the other, I'm not sure they realize there's a slight difference beyond color.
There's also a compucase model available from several vendors, Casedepot for example. I haven't worked with that particular model, but compucase usually makes good stuff. Wouldn't appear to be the best in terms of airflow.
You could go with the enlight recommended above, provided you use the right optical drive as specified. They don't really breathe worth a damn unless you open up the holes in the front bezel, however... and there's no rear fan mount, very important with the heat output from modern systems...