I'm good on cpu i have a 3930k just need a better gpu for gaming and recording
Let's we split the it..
1. Video editing..
you have the highest tier of cpu..
even with onboard gpu, your can do all of your video recording and editing task with no issue..
While your thinking about graphics card, single fast gpu always better than 2 slow gpus..
more than one can can cause a problem,
such as stuterring , unsuffice power supply , and game discompatibility..
so i suggest you go with single 660Ti rather than sli 560Ti..