Are you sure you are ready to move on to such a high level camera. I agree, the video on a a D5300 isn't great - I have one though I mainly use it for photography. The last season of House was shot on the 5D I believe. I would, in your shoes, get a cheaper camera such as the 70D and buy some nice glass for it as well as good rigs such as a nice shoulder rig and/or cage...