The monitor you have chosen isnt a bad one but may i suggest this one: LG W2363D. Its at a very good price and is 120Hz and has a 3ms response rate. Its also 3D and i believe is compatable with nVidia 3D vision.....just for future proofing maybe? Not sure if you intend to use 3D or anything. Anyway this looks to be a great gaming monitor. Another good option could be: Asus VG236H....this one however is a little more expensive.
I'm thinking about this case: BitFenix Colossus Venom w/Window. I've been reading reviews on cases and so far, all the ones I've liked have had some big problems. This one seems pretty solid, albeit a little more flashy than I'd like.
As far as soundcards...I guess I'll have to keep researching because I'm not sure I want to stick with onboard.