I think technology has advanced far enough that you can cram it in to small cases. No longer do you need a whole bundle of HDs to get 2TB of capacity without spending silly money - a single drive will do the job perfectly fine. I went for my FT03 as it has a very small footprint (admittedly it's reasonably tall), but still fits a full GTX 580 (or two!) and mATX board with all the trimmings. Far better choice than full ATX, the only features I've lost are multiple PCIe slots that wouldn't have been used anyway.