I'm going to throw my vote towards the Corsair 600T especially b/c it's extremely adaptable to watercooling with the amazing top-res holder. Add that to the optional side panel is comes with which allows you to mount 4x120mm fans on the side for super exhaust + the 2 200mm fans it comes with and the built in fan controller. Throw in the super sexy white version which I picked up and the super easy tool-less design.... man it's a nice case. I'm running an insane setup in mine and have room for more and more LOL
It's my current case, but in the dozen or so I've built, it has been the easiest and most enjoyable build. If you keep your PCs for a while and upgrade them as needed, it will serve you for a long time.
With that being said, it has 2 pretty big draw backs. The 1 USB 3.0 port (with extension cable) is a turd. I wan't to violently shake the person that incorporated that design. The other: it's huge. I know it's billed out as a mid tower ATX, but it's every bit as big as a full tower.