+1 on the 8GB of memory. You will find the difference between 4GB and 8GB like night and day. The same way I found the difference between 8 and 16. Windows will use as much as you can throw at it. If given the opportunity, Windows 7 will use 4 to 5GB idle.
If you are video editing, I'd highly recommend getting 16GB of memory. Although you may not 'need' it right now, you may find your skills and requirements grow to the point where you will want a full shot in RAM ready for a pre-render without having to burn up your scratch disk to get it done. Won't impact on games too much. Although Star Citizen is probably in a different league to other games currently as another CPU generation will have passed most likely before it's completely finished up.
Video card looks good.
Spend more money on the processor. I'm an AMD fan and everyone is right when they say it is crap. Get the 8 core variation. Don't listen to the "8 cores sucks with games" crowd as Star Citizen will likely be geared towards using every single thread thrown at it.
Power supply is about minimum I'd put in a gaming computer today. Headroom might be a problem if you plan to upgrade anything later, such as the video card. Good ones are hungry beasts.
Ditch the Toshiba 1TB drive and switch it out for a 1TB Western Digital Black model. Don't go with Red or Green. Green will die on you prematurely because their clever design sucks and I've heard the Reds have firmware/reliability issues. That said, I've got 8 of them in a cluster right now and have had no problems.
Optional Must Have Extras (In my opinion):
- Noctua NH-D14/15. Why? You're going to be rendering and it's one of the best (if not the best) air cooler on the planet. It's pricy, but you get what you pay for. Excellence and satisfaction. Check that it fits in your case first.
- SSD. Why? Because SSDs are amazing. Just get a cheap one and put your OS, editing package and a few games on it. Store everything else on metal and you will have a much faster PC all up.