Sigh. There is no "best" overall - you have to tailor it to the kind of shooting you do. It sounds like right now, you don't know, so buying the best will be of no benefit - most PAID video work has little to do with absolute best IQ. I have a documentary production studio and do well into 6 figures of profit a year in video work - I could "afford" any video camera on the market, including something like an F55 or the like. I choose to work with a 5DIII right now because it fits what I do, not because it's best. I don't want slow setups, I don't want people gawking at me when I am working on the street, I just want to get my work done quickly and the DSLR does that, while providing me control over the image in a way I'm comfortable with.
I look at my work just 3 years ago and now and it's worlds apart and it has nothing to do with the equipment I use - it's about understanding what I want to get and how to get it. You sort of hit a pet peeve of mine (common in some of my clients) that they can "buy" their way into video work by having the right equipment. I've watched documentaries that were shot on $500 handy cams that blow my work, shot with $25,000 worth of gear, out of the water - because they knew *exactly* what story they were trying to tell, how to tell it, and how to use their gear to the absolute best of its ability. Get a camera you can afford (the suggestion of the 70D is a good one) and start shooting. You'll start to figure out what works and what doesn't - then upgrade later. I did more than $150,000 worth of work on a Canon 7D ($1300), secured another $200,000 worth of work based on that previous work, and sold the 7D for $1100. Just get something and learn.