Thanks for the input!
Yes, the flanger is coming from the E433. It has 4 types of chorus settings -- 2 regular chorus, and 2 flangers.
Those keyboards -- the CTX800 and DGX650 -- should give you a pretty good range of sound and performance options, especially with the 88-key piano-action feel of the DGX. Adding a PSR-E400 series keyboard would give you more live control options with the knobs, which aren't available on the Casio and DGX, but if you're also considering an EX600, that would give you a lot more -- but at more than twice the cost of the E400 series keyboard.
You mentioned the possibility of a new Casio -- do you mean one of the new CT500 or CT1000V models? While I could not imagine using one of those as a sole keyboard, since you cannot access registration buttons and style-control buttons at the same time, I could see it as a secondary keyboard to use along with other keyboards during a live performance. Or, it could be used for a multi-track recording set-up, where access to registrations and style-control at the same time wouldn't be so necessary.
The video was just something I put together fairly quickly to show the features I installed in my car, and I did not make too much of an effort to sync the video action to the music. I didn't want to use someone else's copyrighted music for the background, so I used one of my original copyrighted songs!