Sound cards are unnecessary nowdays. The only exception is if you're a huge audiophile. Even then, I would order everything else and wait to see if you can tell a difference in the sound. You can always stick it in later.
The case is a tad too small for the GPU. It will fit, but it's tight and may require a lot of finese, banged up hands and/or possible modding of the case to make it work. I highly recommend the HAF 922 or Antec 900. The HAF should only be $20-30 more (about the same as you save on switching the RAM), and is easily one of the best cases around.