hp sas expander

Hello everyone. I am in search of a case, near mid-tower size to handle at least 15HDD for a DAS/JBOD. The cheapest options I found are based on those 9-bay DVD Duplicators. I woud then use 3x (3x5.25 to 5x3.5) backplanes to hold 15 HDDs. Output would be from a HP SAS Expander to an Areca 1880...