First off, how intense will your editing and gaming be on this build? Only reason I ask is because the graphics card *could* be upgraded to a much better model if you'll be needing the power.
Just a few things I'll point out before I head to lunch...
- 6GB of RAM would be plenty (unless you're editing mucho)
- 1000W Power Supply is overkill. Save money on that and get a better video card.
Other parts look fine. Four hard drives, eh? 4TB sounds lovely. Has your man quoted you a price for all of this? Newegg.com and TigerDirect are two sites that many of us forumers use, so you can actually check prices for youself on either website.