Silverstone's FT03 looks quite nice too. It supports two graphics cards upto 13.77” long and the Mini version can take a 10" card (which would be enough for a GTX 670 or 680).
http://i.imgur.com/64bNaFx.jpg
http://i.imgur.com/jWLsvra.jpg
Would you need more than 16GB RAM? 8GB DIMMs aren't that expensive (~£70 for a dual channel kit).

