If I was going to buy a tower case with lots of storage capability I would probably hit up this series http://nanoxia-world.com/en/products/cases/ They actually have a case that goes from a boatload of drives down to just a few.
Nanoxia Deep Silence 6
5.25 inch drive bay external: 4 x 2.5/3.5 inch drive bay internal: 10 x (max. 13)
I wanted to find something with 10 - 11 drives comfortably, and the NZXT will work well, and much cheaper than really large case solutions. Nice to see Rosewill making a good drop in solution for other possible builds down the road.