I'm doing a new build and I can't decide between the Obsidian 650D or Carbide 500R or the Obsidian 750D. I am installing a Corsair Hydro 110 liquid cooling system which has a 280mm radiator. All 3 cases will fit the radiator. Just can't decide which one. The one draw back to the 500R is I can't have the push pull method because I can't fit fans on both sides of the radiator.