[Havoc]

The components look good to me for a decent gaming computer. I'm not sure if you need a 750W PSU though. It's probably overkill. A setup like this should easily run with a 450W or 600W supply unless you plan on adding a second graphics card in the future AND overclocking the entire thing. Also make sure that, no matter what PSU you decide to get, you get one with the golden 80 plus certificate (means they are very efficient and don't waste a lot of power).

For the hard drives I would recommend getting a small SSD (60GB or so should be very affordable these days). Use that to install Windows. Then get a 1TB HDD for all your programs, games and your editing software. Then, if budget allows it, get another 1-3 TB drive to use as your video editing drive. This can hold all your raw footage, rendered footage and temp editing files. This way the editing software installation is separate from the footage used in editing, making the entire process much faster (especially with Windows running on yet another separate drive).

This setup also helps in gaming because the games won't be installed on the same drive as Windows, thus speeding up loading times in particular.

If you have money to spare by the end of all this invest it into more RAM. Never enough RAM while playing games and particularly while editing HD footage. Upgrading the CPU might help with rendering time but it's up to you to decide if that's worth the investment.