I suggest you get the HAF 922 over the Antec 900.
Its gona be a ***** trying to fit your video cards, poor cable management and cramped space with the Antec 900. I had to cut holes in my mobo tray + rearranging the HDDs in my Antec 900 to fit my 260 and 9800. Since your getting a modular psu expect a wire mess at the bottom of your case.
Haf 922 would be a much better choice. Alot more space, more air flow, cable management etc.
Btw their both the same price on newegg
http://www.newegg.com/Product/Produc...-197-_-Product