Main case is a be quiet! Dark Base 900 Pro - It's huge and configurable. Not had it too long but I'm fairly happy with it and would recommend it to anyone wanting to build a beast, or just show off the guts of their machine in shiny glassy glory.
Also running a Fractal Arc Mini R2 - it was my main case up until the DBP upgrade - threw some Aerocool fans in there and it's been brilliant. Currently having a secondary gaming rig built in to it for the Mrs (co-op Portal!)
I'm about to buy a Silverstone DS380B for an upgraded NAS build as well - which is exciting. To me.