I am planning to build a similar PC, and the DB4 case is on top of my list.
I am also considering HDPLEX [1] and Cirrus7 [2] cases. The HDPLEX H1 is a bit less pretty, but seems able to cool many Xeons with its 1 kg cooper heatsink (!). Cirrus7 is somewhere in the middle, and also a bit harder to assemble. They are typically sold as ready-made systems.