Three things:
Graphic cards are fine, both ways. Remember that you need a very good monitor as well.
Another thing, if you're planning to use it as a gaming rig, heavily, consider purchasing a gaming mobo from Nvidia or Asus. The current Gigabyte mobo is, well, crap.
Bling cases that are shiny and have shiny shiny shines and all other purty lights with fairy dust might be cute, but you want to know what Power Supply Unit they come packin' with. PSU failures are the #1 reason computers fuck up, occasionally burning and/or shocking your HDD, sending your vomitous gay furry porn into oblivion. Don't hesitate to spend extra bucks into a very good PSU that will provide your power-hungry graphics card, soundcard and USB pendrives/furry dolls with the appropriate supply of electricity.
An extra would be a powerful PSU that additionally has a silent ventilation system, unless you want your PC to sound like a WW1-era airplane. If it's good enough, and your processor+GFX card fans are good as well, you won't even need a case fan.