We'd need an idea of your budget, for starters. Also, have you read the guidance on asking for advice on a new build?
http://www.tomshardware.co.uk/forum/261222-13-build-advice
Generally, it would be better to select the processor you want first. For video-editing, the i7-2600K is a good choice. If you're not bothered about over-clocking, possibly go for the i7-2600. You can select your motherboard from that point. Graphics card will follow. You'll want a decent amount of RAM...16GB maybe? Again, it's budget-dependant. Your PSU is decent and shouldn't have any issues running a gaming / video-editing system.