I own the Corsair 250D and I can tell you it is amazing. It is not the smallest ITX case avilable, but is pretty much no compromise; beautiful looks, window, fully dust filtered, 2 3.5" bays, 2 2.5" bays, ATX PSU support, 2x 80mm fan support at the back, 2x 120mm fan support on the side, and 120/140/200mm fan support at front, enough space for a thin 120/240mm radiator on the side, or a thick 120/140mm radiator at the front.
The only fault is cable management. While it isn't hard to make the window view look clean, trying to make the whole thing clean is incredibly hard - many, many zipties needed.