Agree with TheBigTroll and his list. Once caveat though. If you want the HAF-X, definitely get it as you'v got heaps of room in your budget for it and it is worth the $200. Maybe even replace the stock fans with LED Megaflows and some LED strips if you have more cash and a desire to make it look awesome.http://www.newegg.com/Product/Product.aspx?Item=N82E16835103072
Huh, Newegg doesn't have Bitfenix Alchemy LED strips, go figure.
As for more motherboard choices, something like this.
Maximus IV Z68 Extreme-Zhttp://www.newegg.com/Product/Product.aspx?Item=N82E16813131760
(with this motherboard youl need the HAF-X. A mid tower just wont support an Extended ATX board.
Or this Asrock Z77 Extreme9http://www.newegg.com/Product/Product.aspx?Item=N82E16813157285&Tpk=Extreme9
I would recommend the AsRock over the Maximus as it is a z77 board and therefore can use the full potential of your Ivy Bridge CPU.