There are a few questions and it would depend on if there is a budget that your working with or not.
The 16gb of ram is ok since your doing video editing and rendering , you wouldn't need that much if this was srtickly a gaming rig.
The Sabertooth is a bit pricey and you can get a good MB for less and have similar features.
The new 660Ti is a good choice.
If your doing overclocking then the 2600K is a better choice over the 3770K but if your not overclocking then the 3770K would be a better choice.
The power supply will defenitly need to be changed to a better brand like Corsair or SeaSonic or Antec.
If your working with a target price and budget then let us know so we're not suggesting parts that are out of the price range of what your willing to spend.