The YouTube link you gave doesn't work, I assume you meant this:
https://www.youtube.com/watch?v=JesaZVbLE28
I think if you work on filmography and technique and good editing you can make up for an inexpensive camera. Get some good editing software. Don't even bother with Windows Movie Maker
That said, cameras are always getting better and better.
A cool rotation shot could be achieved a couple of ways. A tripod on a dolly (maybe use your robot cart?), a stabilizer, software stabilization. One cheap and dirty way to do it would be to stick your camera on a tripod, start recording, and get your robot to turn in place.