OK, here you go on a couple of things;
a. case - Anetc P182 - nice case, classy but not flashy, good cooling, lots of room, good wire management design. Recommend replacing the Antec fans with Scythe Slipstream 120mm 1200 rpm versions. For PS I would recommend PPC&C 750W Silencer, or if you want modular cabling, an Enermax Mod82 version.
b. mobo - I won't recommend an SLI board to anyone, there are too many potential problems with nVidia chipset boards, and frankly, I feel that recommending one to someone would be doing them a disservice. Feel free to google for issues with respect to the recent nVidia mobo chipsets.
c. you seem to have your mind made up wrt a video card, so I won't make a recommendation there.
So bottom line, a case and PS recommendation.