Building new desktop PC

Hi, I want to build my first desktop PC. I have been doing some research over the past few days to select some parts. So any help or guidance would be great.

Approximate Purchase Date: Around this week or so.

Budget Range: varies, or around ~$800-900

System Usage from Most to Least Important: usually graphic work, rendering, streaming, internet, movies, and some games.
note: If I do start playing games, I will be at it for at least 7-8 hours straight These times usually comes once couple weeks or so. So more stable system would be nice.

Are you buying a monitor: no

Parts to Upgrade: new build

Do you need to buy OS:: No, got new OS from school.

Preferred Website(s) for Parts: any reputable sites.

Location:: United States

Overclocking: : yes

SLI or Crossfire:: no

Your Monitor Resolution: : 1920x1080

Additional Comments:: I picked some parts. There are no particular reasons why I pick these parts. Feel free to suggest any parts that are cheaper or works better. Stability is what I am looking for.

help me pick a case, seems like any atx case would work. There are just too many to choose from.

note: can't change the cpu, I am 100% sure that this is the one that I will definitely have, soon.
I already have some of the parts like HHD, burners, mouse, keyboard and so fore...

http://pcpartpicker.com/p/sFpb
thanks in advance.