Is this a good configuration for my first PC build under $2000?

are you just bragging? It really doesn't get any better than that. You can run pretty much ANY game on highest settings easily. The only thing that could make that better would be 16gb of RAM and a hexa core processor even though those are totally unnecessary. Even still many, if not all games, don't utilize all 4 cores, and 12gb of RAM still seems excessive, but i can't talk for hd video editing. You are pretty much set for a good 10, 15 years maybe more. If this is your build, you are very future proof as you are very near the pinnacle of PC components.