Case: I suppose the black Armor+ would be the better bang for the buck, I was just trying to save a little weight with the aluminum case and I absolutely love the silver color but we'll see still within the budget with the aluminum.. But I'm keeping the cost of a 4870x2 in consideration as well. I imagine it'll be a while before a price for it comes out. Surely it will compete against the gtx280 in all areas..
You get what case you like, I was just posting other cases at that price range to see if you liked them.